{"id":3564,"date":"2026-04-30T06:05:36","date_gmt":"2026-04-30T06:05:36","guid":{"rendered":"https:\/\/productionscrews.com\/unc-thread\/"},"modified":"2026-04-30T06:06:08","modified_gmt":"2026-04-30T06:06:08","slug":"unc-thread","status":"publish","type":"post","link":"https:\/\/productionscrews.com\/vi\/unc-thread\/","title":{"rendered":"Thread UNC: H\u01b0\u1edbng d\u1eabn \u0111\u1ea7y \u0111\u1ee7 v\u1ec1 ti\u00eau chu\u1ea9n ren th\u00f4 qu\u1ed1c gia th\u1ed1ng nh\u1ea5t"},"content":{"rendered":"<h1>Thread UNC: H\u01b0\u1edbng d\u1eabn \u0111\u1ea7y \u0111\u1ee7 v\u1ec1 ti\u00eau chu\u1ea9n ren th\u00f4 qu\u1ed1c gia th\u1ed1ng nh\u1ea5t<\/h1>\n<p class=\"direct-answer\"><strong>Ren UNC (Unified National Coarse - Ren Nhan Qu\u1ed1c Gia Th\u00f4) l\u00e0 ren bu l\u00f4ng ti\u00eau chu\u1ea9n c\u1ee7a M\u1ef9 d\u1ef1a tr\u00ean inch, c\u00f3 h\u00ecnh d\u1ea1ng g\u00f3c 60\u00b0, \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1edfi \u0111\u01b0\u1eddng k\u00ednh v\u00e0 s\u1ed1 ren tr\u00ean m\u1ed7i inch (TPI), v\u00e0 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong ph\u1ea7n l\u1edbn c\u00e1c bu l\u00f4ng, v\u00edt, \u0111ai \u1ed1c \u0111a d\u1ee5ng \u0111\u01b0\u1ee3c s\u1ea3n xu\u1ea5t t\u1ea1i Vi\u1ec7t Nam v\u00e0 c\u00e1c qu\u1ed1c gia kh\u00e1c.<\/strong><\/p>\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/productionscrews.com\/wp-content\/uploads\/2026\/04\/unc-thread-hero.jpg\" alt=\"Ren UNC \u2014 h\u00ecnh minh h\u1ecda ch\u00ednh th\u1ec3 hi\u1ec7n ph\u1ea7n c\u1eaft chi ti\u1ebft c\u1ee7a b\u1ed9 n\u1ed1i \u1ed1c v\u00edt ren th\u00f4 v\u00e0 \u0111ai \u1ed1c\" \/><\/figure>\n<p>B\u01b0\u1edbc v\u00e0o b\u1ea5t k\u1ef3 c\u01a1 s\u1edf s\u1ea3n xu\u1ea5t, x\u01b0\u1edfng gia c\u00f4ng ho\u1eb7c c\u1eeda h\u00e0ng ph\u1ea7n c\u1ee9ng n\u00e0o \u1edf Vi\u1ec7t Nam, ren UNC xu\u1ea5t hi\u1ec7n kh\u1eafp n\u01a1i. V\u00edt \u0111\u1ea7u ch\u1ee5p 1\/4-20 gi\u1eef ch\u1ed1t b\u1ea3o v\u1ec7 m\u00e1y c\u1ee7a b\u1ea1n? UNC. Bu l\u00f4ng 3\/8-16 tr\u00ean gi\u00e1 \u0111\u1ee1 \u0111\u1ed9ng c\u01a1 c\u1ee7a b\u1ea1n? UNC. Bu l\u00f4ng neo 1\/2-13 \u0111\u00fac v\u00e0o s\u00e0n b\u00ea t\u00f4ng c\u1ee7a c\u01a1 s\u1edf b\u1ea1n? C\u0169ng l\u00e0 UNC.<\/p>\n<p>Tuy nhi\u00ean, \u0111\u1ed1i v\u1edbi th\u1ee9 ph\u1ed5 bi\u1ebfn nh\u01b0 v\u1eady, ren UNC th\u1ef1c s\u1ef1 b\u1ecb hi\u1ec3u l\u1ea7m \u2014 k\u1ef9 s\u01b0 nh\u1ea7m l\u1eabn ch\u00fang v\u1edbi UNF, th\u1ee3 m\u00e1y nh\u1ea7m l\u1eabn ch\u00fang v\u1edbi ren \u1ed1ng NPT, v\u00e0 ng\u01b0\u1eddi mua \u0111\u1eb7t h\u00e0ng sai lo\u1ea1i ren v\u00e0 t\u1ef1 h\u1ecfi t\u1ea1i sao v\u1eeba l\u1eafp v\u1eeba kh\u00f4ng v\u1eeba ho\u1eb7c kh\u00f4ng th\u1ec3 l\u1eafp r\u00e1p \u0111\u01b0\u1ee3c. H\u01b0\u1edbng d\u1eabn n\u00e0y bao g\u1ed3m m\u1ecdi th\u1ee9 t\u1eeb h\u00ecnh h\u1ecdc c\u01a1 b\u1ea3n \u0111\u1ebfn quy t\u1eafc l\u1ef1a ch\u1ecdn m\u00e0 b\u1ea1n c\u00f3 th\u1ec3 \u00e1p d\u1ee5ng ngay tr\u00ean s\u00e0n s\u1ea3n xu\u1ea5t h\u00f4m nay.<\/p>\n<hr \/>\n<h2>Ren UNC l\u00e0 g\u00ec?<\/h2>\n<p>Ren UNC \u2014 vi\u1ebft t\u1eaft c\u1ee7a <strong>Unified National Coarse<\/strong> \u2014 l\u00e0 lo\u1ea1i ren bu l\u00f4ng c\u00f3 b\u01b0\u1edbc th\u00f4 \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a theo <a href=\"https:\/\/en.wikipedia.org\/wiki\/Unified_Thread_Standard\" target=\"_blank\" rel=\"noopener\">Ti\u00eau chu\u1ea9n Ren Th\u1ed1ng Nh\u1ea5t<\/a>, ti\u00eau chu\u1ea9n ren d\u1ef1a tr\u00ean inch ph\u1ed5 bi\u1ebfn \u1edf Vi\u1ec7t Nam. Thu\u1eadt ng\u1eef th\u00f4 c\u00f3 ngh\u0129a l\u00e0 n\u00f3 c\u00f3 <em>b\u01b0\u1edbc t\u01b0\u01a1ng \u0111\u1ed1i l\u1edbn<\/em> (\u00edt ren tr\u00ean m\u1ed7i inch) so v\u1edbi c\u00e1c lo\u1ea1i ren c\u00f3 b\u01b0\u1edbc tinh h\u01a1n.<\/p>\n<p>Ti\u00eau chu\u1ea9n Ren Th\u1ed1ng Nh\u1ea5t \u0111\u01b0\u1ee3c ch\u00ednh th\u1ee9c h\u00f3a v\u00e0o n\u0103m 1948 nh\u01b0 m\u1ed9t th\u1ecfa thu\u1eadn li\u00ean h\u1ee3p gi\u1eefa c\u00e1c qu\u1ed1c gia \u0111\u1ec3 thay th\u1ebf c\u00e1c h\u1ec7 th\u1ed1ng ren qu\u1ed1c gia kh\u00f4ng t\u01b0\u01a1ng th\u00edch \u0111\u00e3 g\u00e2y ra kh\u00f3 kh\u0103n trong cung \u1ee9ng trong Th\u1ebf chi\u1ebfn th\u1ee9 hai. Hi\u1ec7n nay, ASME B1.1 l\u00e0 t\u00e0i li\u1ec7u quy \u0111\u1ecbnh cho ren UNC v\u00e0 t\u1ea5t c\u1ea3 c\u00e1c d\u1ea1ng ren Th\u1ed1ng Nh\u1ea5t kh\u00e1c t\u1ea1i Vi\u1ec7t Nam.<\/p>\n<h3>Gia \u0111\u00ecnh Ti\u00eau chu\u1ea9n Ren Th\u1ed1ng Nh\u1ea5t (UTS)<\/h3>\n<p>UNC l\u00e0 m\u1ed9t th\u00e0nh vi\u00ean trong gia \u0111\u00ecnh r\u1ed9ng l\u1edbn h\u01a1n theo Ti\u00eau chu\u1ea9n Ren Th\u1ed1ng Nh\u1ea5t:<\/p>\n<ul>\n<li><strong>UNC (Unified National Coarse)<\/strong> - ph\u1ed5 bi\u1ebfn nh\u1ea5t, \u0111a d\u1ee5ng, b\u1ec1n b\u1ec9 v\u1edbi b\u1ee5i b\u1ea9n v\u00e0 h\u01b0 h\u1ecfng<\/li>\n<li><strong>UNF (Unified National Fine)<\/strong> - b\u01b0\u1edbc tinh h\u01a1n, \u0111\u1ed9 b\u1ec1n k\u00e9o cao h\u01a1n theo \u0111\u01b0\u1eddng k\u00ednh, d\u00f9ng \u1edf n\u01a1i c\u1ea7n ch\u1ed1ng rung<\/li>\n<li><strong>UNEF (Unified National Extra Fine)<\/strong> - b\u01b0\u1edbc c\u1ef1c tinh, ch\u1ee7 y\u1ebfu trong h\u00e0ng kh\u00f4ng v\u00e0 d\u1ee5ng c\u1ee5 ch\u00ednh x\u00e1c<\/li>\n<li><strong>UNS (Unified National Special)<\/strong> - c\u00e1c t\u1ed5 h\u1ee3p TPI kh\u00f4ng ti\u00eau chu\u1ea9n d\u00f9ng cho c\u00e1c y\u00eau c\u1ea7u k\u1ef9 thu\u1eadt \u0111\u1eb7c bi\u1ec7t<\/li>\n<li><strong>UN (Qu\u1ed1c gia Th\u1ed1ng nh\u1ea5t)<\/strong> \u2014 m\u1ed9t lo\u1ea1i t\u1ed5ng h\u1ee3p cho c\u00e1c lo\u1ea1t series c\u1ed1 \u0111\u1ecbnh \u0111\u1eb7c bi\u1ec7t (4-UN, 6-UN, 8-UN, v.v.) \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c \u1ee9ng d\u1ee5ng \u0111\u01b0\u1eddng k\u00ednh l\u1edbn nh\u01b0 m\u1eb7t b\u00edch b\u00ecnh \u00e1p l\u1ef1c<\/li>\n<\/ul>\n<p>Trong th\u1ef1c t\u1ebf, khi ai \u0111\u00f3 n\u00f3i \u201c\u1ed1c v\u00edt ti\u00eau chu\u1ea9n,\u201d h\u1ecd g\u1ea7n nh\u01b0 lu\u00f4n ngh\u0129 \u0111\u1ebfn UNC. \u0110\u00f3 l\u00e0 m\u1eb7c \u0111\u1ecbnh b\u1ea1n ch\u1ecdn tr\u1eeb khi c\u00f3 l\u00fd do c\u1ee5 th\u1ec3 \u0111\u1ec3 ch\u1ecdn lo\u1ea1i tinh h\u01a1n.<\/p>\n<h3>H\u1ec7 th\u1ed1ng Ch\u1ec9 \u0111\u1ecbnh Ren UNC Gi\u1ea3i th\u00edch<\/h3>\n<p>M\u1ed9t ph\u1ea7n g\u1ecdi t\u00ean ren UNC ho\u00e0n ch\u1ec9nh theo m\u1eabu sau:<\/p>\n<p><strong>[\u0110\u01b0\u1eddng k\u00ednh] \u2013 [TPI] UNC \u2013 [L\u1edbp][Trong\/Ngo\u00e0i]<\/strong><\/p>\n<p>V\u00ed d\u1ee5:<\/p>\n<ul>\n<li><strong>1\/4-20 UNC-2A<\/strong> = \u0110\u01b0\u1eddng k\u00ednh danh ngh\u0129a 1\/4 inch, 20 ren tr\u00ean inch, L\u1edbp 2, ren ngo\u00e0i (A = ngo\u00e0i, B = trong)<\/li>\n<li><strong>3\/8-16 UNC-2B<\/strong> = \u0110\u01b0\u1eddng k\u00ednh 3\/8 inch, 16 TPI, L\u1edbp 2, ren trong (l\u1ed7 khoan)<\/li>\n<li><strong>1\/2-13 UNC-3A<\/strong> = \u0110\u01b0\u1eddng k\u00ednh 1\/2 inch, 13 TPI, L\u1edbp 3 (k\u1ebft h\u1ee3p ch\u00ednh x\u00e1c), ren ngo\u00e0i<\/li>\n<\/ul>\n<p>Cho <a href=\"https:\/\/productionscrews.com\/vi\/essential-screws-choosing-the-right-fasteners-for-your-projects\/\" target=\"_blank\" rel=\"noopener\" data-wpil-monitor-id=\"893\">\u1ed1c v\u00edt v\u00e0 bu l\u00f4ng<\/a> nh\u1ecf h\u01a1n 1\/4 inch, m\u1ed9t k\u00fd hi\u1ec7u s\u1ed1 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng thay v\u00ec ph\u00e2n s\u1ed1: <strong>#4-40 UNC<\/strong>, <strong>#6-32 UNC<\/strong>, <strong>#10-24 UNC<\/strong>, v.v. S\u1ed1 n\u00e0y t\u01b0\u01a1ng \u1ee9ng v\u1edbi c\u00f4ng th\u1ee9c \u0111\u01b0\u1eddng k\u00ednh danh ngh\u0129a: \u0111\u01b0\u1eddng k\u00ednh danh ngh\u0129a (inch) = (N \u00d7 0.013) + 0.060, trong \u0111\u00f3 N l\u00e0 s\u1ed1 v\u00edt.<\/p>\n<h3>B\u1ea3ng k\u00edch th\u01b0\u1edbc ren UNC ti\u00eau chu\u1ea9n<\/h3>\n<p>B\u1ea3ng d\u01b0\u1edbi \u0111\u00e2y bao g\u1ed3m c\u00e1c lo\u1ea1i ren UNC ph\u1ed5 bi\u1ebfn nh\u1ea5t trong ba ph\u1ea1m vi k\u00edch th\u01b0\u1edbc. \u0110\u00e2y l\u00e0 c\u00e1c k\u00edch th\u01b0\u1edbc b\u1ea1n s\u1ebd g\u1eb7p tr\u00ean m\u1ed9t d\u00e2y chuy\u1ec1n s\u1ea3n xu\u1ea5t \u0111i\u1ec3n h\u00ecnh.<\/p>\n<table>\n<thead>\n<tr>\n<th>K\u00edch th\u01b0\u1edbc<\/th>\n<th>\u0110\u01b0\u1eddng k\u00ednh danh ngh\u0129a (in)<\/th>\n<th>TPI<\/th>\n<th>Khoan \u0110\u1ee5c (in)<\/th>\n<th>\u0110\u01b0\u1eddng K\u00ednh Ch\u00ednh (in)<\/th>\n<th>\u0110\u01b0\u1eddng K\u00ednh N\u00e9n (in)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>#4-40 UNC<\/td>\n<td>0.112<\/td>\n<td>40<\/td>\n<td>#43 (0.089)<\/td>\n<td>0.112<\/td>\n<td>0.0958<\/td>\n<\/tr>\n<tr>\n<td>#6-32 UNC<\/td>\n<td>0.138<\/td>\n<td>32<\/td>\n<td>#36 (0.1065)<\/td>\n<td>0.138<\/td>\n<td>0.1177<\/td>\n<\/tr>\n<tr>\n<td>#8-32 UNC<\/td>\n<td>0.164<\/td>\n<td>32<\/td>\n<td>#29 (0.136)<\/td>\n<td>0.164<\/td>\n<td>0.1437<\/td>\n<\/tr>\n<tr>\n<td>#10-24 UNC<\/td>\n<td>0.190<\/td>\n<td>24<\/td>\n<td>#25 (0.1495)<\/td>\n<td>0.190<\/td>\n<td>0.1629<\/td>\n<\/tr>\n<tr>\n<td>1\/4-20 UNC<\/td>\n<td>0.250<\/td>\n<td>20<\/td>\n<td>#7 (0.201)<\/td>\n<td>0.250<\/td>\n<td>0.2175<\/td>\n<\/tr>\n<tr>\n<td>5\/16-18 UNC<\/td>\n<td>0.3125<\/td>\n<td>18<\/td>\n<td>F (0.257)<\/td>\n<td>0.3125<\/td>\n<td>0.2764<\/td>\n<\/tr>\n<tr>\n<td>3\/8-16 UNC<\/td>\n<td>0.375<\/td>\n<td>16<\/td>\n<td>5\/16 (0.3125)<\/td>\n<td>0.375<\/td>\n<td>0.3344<\/td>\n<\/tr>\n<tr>\n<td>1\/2-13 UNC<\/td>\n<td>0.500<\/td>\n<td>13<\/td>\n<td>27\/64 (0.4219)<\/td>\n<td>0.500<\/td>\n<td>0.4500<\/td>\n<\/tr>\n<tr>\n<td>5\/8-11 UNC<\/td>\n<td>0.625<\/td>\n<td>11<\/td>\n<td>17\/32 (0.5313)<\/td>\n<td>0.625<\/td>\n<td>0.5660<\/td>\n<\/tr>\n<tr>\n<td>3\/4-10 UNC<\/td>\n<td>0.750<\/td>\n<td>10<\/td>\n<td>21\/32 (0.6563)<\/td>\n<td>0.750<\/td>\n<td>0.6850<\/td>\n<\/tr>\n<tr>\n<td>1-8 UNC<\/td>\n<td>1.000<\/td>\n<td>8<\/td>\n<td>7\/8 (0.875)<\/td>\n<td>1.000<\/td>\n<td>0.9188<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr \/>\n<h2>K\u00edch Th\u01b0\u1edbc v\u00e0 Th\u00f4ng S\u1ed1 Ren UNC<\/h2>\n<p>Hi\u1ec3u r\u00f5 h\u00ecnh h\u1ecdc \u0111\u1eb1ng sau ren UNC gi\u00fap tr\u00e1nh nh\u1eefng sai l\u1ec7ch t\u1ed1n k\u00e9m trong thi\u1ebft k\u1ebf v\u00e0 mua s\u1eafm. C\u00f3 nhi\u1ec1u h\u01a1n l\u00e0 ch\u1ec9 \u201ck\u00edch th\u01b0\u1edbc tr\u00ean h\u1ed9p\u201d.<\/p>\n<h3>G\u00f3c Ren, B\u01b0\u1edbc Ren, v\u00e0 TPI<\/h3>\n<p>M\u1ed7i ren UNC c\u00f3 m\u1ed9t <strong>G\u00f3c ren bao g\u1ed3m 60\u00b0<\/strong> \u2014 \u0111\u00e2y l\u00e0 g\u00f3c b\u1ea1n \u0111o t\u1ea1i \u0111\u1ec9nh c\u1ee7a h\u00ecnh d\u1ea1ng ren. H\u1ed3 s\u01a1 60\u00b0 n\u00e0y \u0111\u01b0\u1ee3c chia s\u1ebb v\u1edbi ren ISO m\u00e9t, \u0111\u00f3 l\u00e0 l\u00fd do t\u1ea1i sao ren UNC v\u00e0 ren m\u00e9t tr\u00f4ng gi\u1ed1ng nhau tr\u00ean th\u01b0\u1edbc \u0111o nh\u01b0ng kh\u00f4ng th\u1ec3 ho\u00e1n \u0111\u1ed5i cho nhau (h\u1ec7 th\u1ed1ng b\u01b0\u1edbc v\u00e0 \u0111\u01b0\u1eddng k\u00ednh ho\u00e0n to\u00e0n kh\u00e1c).<\/p>\n<p><strong>TPI (s\u1ed1 ren tr\u00ean inch)<\/strong> l\u00e0 tham s\u1ed1 b\u01b0\u1edbc x\u00e1c \u0111\u1ecbnh cho ren UNC. N\u00f3 cho bi\u1ebft c\u00f3 bao nhi\u00eau \u0111\u1ec9nh ren ho\u00e0n ch\u1ec9nh ph\u00f9 h\u1ee3p trong m\u1ed9t inch tuy\u1ebfn t\u00ednh. M\u1ed9t v\u00edt 1\/4-20 UNC c\u00f3 20 \u0111\u1ec9nh trong m\u1ed7i inch chi\u1ec1u d\u00e0i ren c\u1ee7a n\u00f3. <strong>B\u01b0\u1edbc Ren<\/strong> (t\u00ednh b\u1eb1ng inch) \u0111\u01a1n gi\u1ea3n l\u00e0 ngh\u1ecbch \u0111\u1ea3o c\u1ee7a TPI:<\/p>\n<blockquote><p>B\u01b0\u1edbc Ren = 1 \u00f7 TPI<\/p><\/blockquote>\n<p>\u0110\u1ed1i v\u1edbi 1\/4-20 UNC: B\u01b0\u1edbc Ren = 1 \u00f7 20 = <strong>0.050 inch<\/strong> m\u1ed7i v\u00f2ng ren. \u0110\u00f3 c\u0169ng l\u00e0 kho\u1ea3ng c\u00e1ch m\u00e0 v\u00edt ti\u1ebfn t\u1edbi m\u1ed7i v\u00f2ng xoay.<\/p>\n<p>Ren UNC th\u00f4 c\u00f3 gi\u00e1 tr\u1ecb TPI th\u1ea5p h\u01a1n so v\u1edbi ren UNF tinh c\u00f9ng \u0111\u01b0\u1eddng k\u00ednh. M\u1ed9t v\u00edt 1\/2-13 UNC c\u00f3 13 TPI; t\u01b0\u01a1ng \u0111\u01b0\u01a1ng l\u00e0 UNF 1\/2-20 v\u1edbi 20 TPI. \u00cdt ren tr\u00ean m\u1ed7i inch = b\u01b0\u1edbc l\u1edbn h\u01a1n = l\u1eafp r\u00e1p nhanh h\u01a1n v\u00e0 kh\u1ea3 n\u0103ng ch\u1ed1ng xo\u1eafn ren ch\u00e9o t\u1ed1t h\u01a1n.<\/p>\n<h3>\u0110\u01b0\u1eddng k\u00ednh Ch\u00ednh, \u0110\u01b0\u1eddng k\u00ednh Nh\u1ecf v\u00e0 \u0110\u01b0\u1eddng k\u00ednh B\u01b0\u1edbc<\/h3>\n<p>Ba \u0111\u01b0\u1eddng k\u00ednh x\u00e1c \u0111\u1ecbnh h\u00ecnh h\u1ecdc c\u1ee7a ren UNC:<\/p>\n<ul>\n<li><strong>\u0110\u01b0\u1eddng k\u00ednh Ch\u00ednh<\/strong> \u2014 \u0111\u01b0\u1eddng k\u00ednh \u0111\u1ec9nh ngo\u00e0i c\u00f9ng. \u0110\u00e2y l\u00e0 th\u1ee9 b\u1ea1n \u0111o b\u1eb1ng th\u01b0\u1edbc c\u1eb7p \u1edf ph\u00eda ngo\u00e0i c\u1ee7a v\u00edt. \u0110\u1ed1i v\u1edbi v\u00edt 1\/4-20 UNC, n\u00f3 c\u00f3 gi\u00e1 tr\u1ecb danh ngh\u0129a l\u00e0 0.250 inch.<\/li>\n<li><strong>\u0110\u01b0\u1eddng k\u00ednh Nh\u1ecf (\u0111\u01b0\u1eddng k\u00ednh g\u1ed1c)<\/strong> \u2014 \u0111\u01b0\u1eddng k\u00ednh nh\u1ecf nh\u1ea5t, \u0111o t\u1ea1i g\u1ed1c ren. Th\u00edch h\u1ee3p \u0111\u1ec3 t\u00ednh di\u1ec7n t\u00edch c\u1eaft c\u1ee7a ren.<\/li>\n<li><strong>\u0110\u01b0\u1eddng k\u00ednh B\u01b0\u1edbc<\/strong> \u2014 h\u00ecnh tr\u1ee5 l\u00fd thuy\u1ebft n\u01a1i \u0111\u1ed9 d\u00e0y c\u1ee7a ren b\u1eb1ng kho\u1ea3ng c\u00e1ch gi\u1eefa c\u00e1c ren. \u0110\u00e2y l\u00e0 th\u1ee9 \u0111o th\u1ef1c t\u1ebf b\u1eb1ng th\u01b0\u1edbc \u0111o ren, v\u00e0 l\u00e0 k\u00edch th\u01b0\u1edbc quan tr\u1ecdng nh\u1ea5t \u0111\u1ec3 ph\u00e2n lo\u1ea1i \u0111\u1ed9 kh\u00edt.<\/li>\n<\/ul>\n<p>Theo <a href=\"https:\/\/fpg.phys.virginia.edu\/fpgweb\/useful_info\/UNC_UNF_threads_1.pdf\" target=\"_blank\" rel=\"noopener\">\u00dd ngh\u0129a c\u1ee7a c\u00e1c th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt ren UNC v\u00e0 UNF<\/a> t\u1eeb khoa V\u1eadt l\u00fd c\u1ee7a tr\u01b0\u1eddng \u0110\u1ea1i h\u1ecdc Virginia, \u0111\u01b0\u1eddng k\u00ednh b\u01b0\u1edbc l\u00e0 k\u00edch th\u01b0\u1edbc ch\u1ee9c n\u0103ng x\u00e1c \u0111\u1ecbnh xem c\u00e1c ren gh\u00e9p c\u00f3 th\u1ec3 l\u1eafp r\u00e1p \u0111\u01b0\u1ee3c hay kh\u00f4ng v\u00e0 kho\u1ea3ng c\u00e1ch r\u00e3nh ren s\u1ebd l\u00e0 bao nhi\u00eau. \u0110\u01b0\u1eddng k\u00ednh b\u01b0\u1edbc c\u1ee7a v\u00edt ph\u1ea3i n\u1eb1m trong ph\u1ea1m vi dung sai c\u1ee7a l\u1edbp \u0111\u1ec3 \u0111\u01b0\u1ee3c ch\u1ea5p nh\u1eadn.<\/p>\n<h3>C\u00e1c l\u1edbp ren: 1A, 2A, 3A (v\u00e0 1B, 2B, 3B)<\/h3>\n<p>L\u1edbp ren l\u00e0 th\u00f4ng s\u1ed1 d\u1ec5 hi\u1ec3u nh\u1ea7m nh\u1ea5t trong h\u1ec7 th\u1ed1ng UNC \u2014 v\u00e0 vi\u1ec7c hi\u1ec3u sai n\u00f3 g\u00e2y ra th\u1ea5t b\u1ea1i trong l\u1eafp r\u00e1p tr\u00ean d\u00e2y chuy\u1ec1n s\u1ea3n xu\u1ea5t. C\u00f3 ba l\u1edbp cho ren ngo\u00e0i (A) v\u00e0 ba l\u1edbp cho ren trong (B):<\/p>\n<table>\n<thead>\n<tr>\n<th>L\u1edbp<\/th>\n<th>Dung sai<\/th>\n<th>Kho\u1ea3ng c\u00e1ch<\/th>\n<th>S\u1eed d\u1ee5ng \u0111i\u1ec3n h\u00ecnh<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>1A \/ 1B<\/td>\n<td>L\u1ecfng nh\u1ea5t<\/td>\n<td>L\u1edbn<\/td>\n<td>C\u00f4ng vi\u1ec7c th\u00f4, l\u1eafp r\u00e1p nhanh, s\u1eeda ch\u1eefa ngo\u00e0i hi\u1ec7n tr\u01b0\u1eddng<\/td>\n<\/tr>\n<tr>\n<td>2A \/ 2B<\/td>\n<td>Ti\u00eau chu\u1ea9n<\/td>\n<td>Trung b\u00ecnh<\/td>\n<td><strong>\u1ed0c v\u00edt \u0111a d\u1ee5ng (95% cho t\u1ea5t c\u1ea3 c\u00e1c \u1ee9ng d\u1ee5ng)<\/strong><\/td>\n<\/tr>\n<tr>\n<td>3A \/ 3B<\/td>\n<td>Ch\u1eb7t nh\u1ea5t<\/td>\n<td>\u00cdt nh\u1ea5t\/kh\u00f4ng c\u00f3<\/td>\n<td>L\u1eafp r\u00e1p ch\u00ednh x\u00e1c, h\u00e0ng kh\u00f4ng v\u0169 tr\u1ee5, d\u1ee5ng c\u1ee5<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>L\u1edbp 2A\/2B l\u00e0 l\u1ef1c l\u01b0\u1ee3ng ch\u00ednh.<\/strong> Khi b\u1ea1n mua m\u1ed9t \u1ed1c v\u00edt \u0111\u1ea7u l\u1ee5c gi\u00e1c ti\u00eau chu\u1ea9n t\u1eeb k\u1ec7, g\u1ea7n nh\u01b0 ch\u1eafc ch\u1eafn \u0111\u00f3 l\u00e0 L\u1edbp 2A. C\u00e1c l\u1ed7 ren l\u1edbp 2B ch\u1ea5p nh\u1eadn bu l\u00f4ng l\u1edbp 2A v\u1edbi m\u1ed9t l\u01b0\u1ee3ng khe h\u1edf ki\u1ec3m so\u00e1t \u0111\u01b0\u1ee3c gi\u00fap l\u1eafp r\u00e1p nhanh ch\u00f3ng trong khi v\u1eabn \u0111\u1ea3m b\u1ea3o k\u1eb9p ch\u1eb7t \u0111\u00e1ng tin c\u1eady.<\/p>\n<p><strong>L\u1edbp 3A\/3B<\/strong> ren \u0111\u01b0\u1ee3c c\u1eaft theo c\u00e1c ti\u00eau chu\u1ea9n ch\u1eb7t ch\u1ebd h\u01a1n \u2014 th\u01b0\u1eddng l\u00e0 \u00b10.0005 inch tr\u00ean \u0111\u01b0\u1eddng k\u00ednh b\u01b0\u1edbc ren so v\u1edbi \u00b10.001 inch cho L\u1edbp 2. Trong th\u1ef1c t\u1ebf, ch\u00fang t\u00f4i nh\u1eadn th\u1ea5y r\u1eb1ng ren l\u1edbp 3 y\u00eau c\u1ea7u d\u1ee5ng c\u1ee5 s\u1ea1ch h\u01a1n, t\u1ed1c \u0111\u1ed9 khoan ch\u1eadm h\u01a1n v\u00e0 dung d\u1ecbch c\u1eaft m\u1edbi \u0111\u1ec3 duy tr\u00ec \u0111\u1ed9 ch\u00ednh x\u00e1c li\u00ean t\u1ee5c trong s\u1ea3n xu\u1ea5t. Ch\u00fang kh\u00f4ng kh\u00f3, nh\u01b0ng b\u1ea1n kh\u00f4ng th\u1ec3 x\u1eed l\u00fd ch\u00fang nh\u01b0 c\u00e1c lo\u1ea1i \u1ed1c v\u00edt th\u00f4ng th\u01b0\u1eddng.<\/p>\n<p><strong>L\u1edbp 1A\/1B<\/strong> ren hi\u1ebfm khi \u0111\u01b0\u1ee3c ch\u1ec9 \u0111\u1ecbnh r\u00f5 r\u00e0ng. B\u1ea1n th\u1ea5y ch\u00fang trong c\u00e1c khu\u00f4n \u0111\u00fac \u0111\u1ed9 ch\u00ednh x\u00e1c th\u1ea5p, nh\u1ef1a v\u00e0 c\u00e1c \u1ee9ng d\u1ee5ng m\u00e0 vi\u1ec7c k\u1ebft n\u1ed1i nhanh quan tr\u1ecdng h\u01a1n \u0111\u1ed9 ch\u00ednh x\u00e1c. M\u1ed9t chi\u1ebfc \u1ed1c l\u1edbp 1A s\u1ebd l\u1eafc l\u01b0 trong l\u1ed7 l\u1edbp 2B \u2014 \u0111\u00f4i khi \u0111i\u1ec1u \u0111\u00f3 ch\u1ea5p nh\u1eadn \u0111\u01b0\u1ee3c, nh\u01b0ng th\u01b0\u1eddng th\u00ec kh\u00f4ng.<\/p>\n<hr \/>\n<h2>UNC so v\u1edbi UNF v\u00e0 c\u00e1c lo\u1ea1i ren kh\u00e1c<\/h2>\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/productionscrews.com\/wp-content\/uploads\/2026\/04\/unc-thread-types.jpg\" alt=\"C\u1eadn c\u1ea3nh c\u00e1c bu l\u00f4ng h\u00ecnh l\u1ee5c gi\u00e1c cho th\u1ea5y ren th\u00f4 UNC v\u00e0 ren tinh UNF v\u1edbi k\u00edch th\u01b0\u1edbc 1\/2&quot;-13 UNC v\u00e0 1\/2&quot;-20 UNF, \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c m\u00f4i tr\u01b0\u1eddng c\u00f4ng nghi\u1ec7p v\u00e0 s\u1ea3n xu\u1ea5t.\"  > <\/figure>\n<p>UNC kh\u00f4ng ph\u1ea3i l\u00e0 ti\u00eau chu\u1ea9n ren duy nh\u1ea5t b\u1ea1n s\u1ebd g\u1eb7p. Bi\u1ebft khi n\u00e0o n\u00ean chuy\u1ec3n t\u1eeb UNC \u2014 v\u00e0 khi n\u00e0o kh\u00f4ng \u2014 l\u00e0 m\u1ed9t quy\u1ebft \u0111\u1ecbnh \u0111\u00e1nh gi\u00e1 gi\u00fap ti\u1ebft ki\u1ec7m th\u1eddi gian k\u1ef9 thu\u1eadt v\u00e0 tr\u00e1nh ph\u1ea3i l\u00e0m l\u1ea1i.<\/p>\n<h3>UNC so v\u1edbi UNF: Khi n\u00e0o d\u00f9ng m\u1ed7i lo\u1ea1i<\/h3>\n<p><strong>UNC (th\u00f4)<\/strong> n\u00ean l\u00e0 m\u1eb7c \u0111\u1ecbnh c\u1ee7a b\u1ea1n. N\u00f3 l\u1eafp r\u00e1p nhanh h\u01a1n, ch\u1ecbu \u0111\u1ef1ng t\u1ed1t h\u01a1n c\u00e1c h\u01b0 h\u1ecfng nh\u1ecf c\u1ee7a ren v\u00e0 \u00f4 nhi\u1ec5m, v\u00e0 c\u00f3 s\u1eb5n trong nhi\u1ec1u lo\u1ea1i v\u1eadt li\u1ec7u v\u00e0 l\u1edbp ph\u1ee7 h\u01a1n t\u1eeb c\u00e1c nh\u00e0 ph\u00e2n ph\u1ed1i h\u00e0ng h\u00f3a. Trong c\u00e1c v\u1eadt li\u1ec7u m\u1ec1m nh\u01b0 nh\u00f4m, \u0111\u1ed3ng thau ho\u1eb7c nh\u1ef1a, b\u01b0\u1edbc ren th\u00f4 h\u01a1n mang l\u1ea1i kh\u1ea3 n\u0103ng ti\u1ebfp x\u00fac ren t\u1ed1t h\u01a1n tr\u00ean m\u1ed7i \u0111\u01a1n v\u1ecb chi\u1ec1u d\u00e0i v\u00e0 gi\u1ea3m nguy c\u01a1 tr\u01b0\u1ee3t ren.<\/p>\n<p><strong>UNF (m\u1ecbn)<\/strong> th\u00edch h\u1ee3p khi:<\/p>\n<ul>\n<li>Ch\u1ed1ng rung l\u00e0 m\u1ed1i quan t\u00e2m ch\u00ednh (ren m\u1ecbn \u00edt c\u00f3 kh\u1ea3 n\u0103ng l\u1ecfng l\u1ebbo d\u01b0\u1edbi t\u1ea3i l\u1eb7p l\u1ea1i \u2014 g\u00f3c xo\u1eafn nh\u1ecf h\u01a1n t\u1ea1o ra nhi\u1ec1u ma s\u00e1t h\u01a1n)<\/li>\n<li>\u0110\u1ed9 d\u00e0y th\u00e0nh t\u01b0\u1eddng b\u1ecb gi\u1edbi h\u1ea1n (ren m\u1ecbn cho ph\u00e9p khoan l\u1ed7 khoan nh\u1ecf h\u01a1n cho c\u00f9ng \u0111\u01b0\u1eddng k\u00ednh bu l\u00f4ng)<\/li>\n<li>B\u1ea1n c\u1ea7n \u0111\u1ed9 ph\u00e2n gi\u1ea3i m\u00f4-men xo\u1eafn tinh h\u01a1n \u2014 c\u00e1c ren nh\u1ecf h\u01a1n ti\u1ebfn xa h\u01a1n m\u1ed7i v\u00f2ng quay, gi\u00fap b\u1ea1n ki\u1ec3m so\u00e1t t\u1ed1t h\u01a1n khi si\u1ebft ch\u1eb7t<\/li>\n<li>\u1ee8ng d\u1ee5ng n\u00e0y thu\u1ed9c ng\u00e0nh \u00f4 t\u00f4 (ph\u1ea7n l\u1edbn ng\u00e0nh c\u00f4ng nghi\u1ec7p \u00f4 t\u00f4 \u0111\u00e3 ti\u00eau chu\u1ea9n h\u00f3a theo UNF cho c\u00e1c b\u1ed9 ph\u1eadn b\u1eaft v\u00edt trong c\u00e1c b\u1ed9 ph\u1eadn d\u1ec5 rung l\u1eafc)<\/li>\n<\/ul>\n<p>S\u1ef1 \u0111\u00e1nh \u0111\u1ed5i: Ren UNF d\u1ec5 b\u1ecb xo\u1eafn ch\u00e9o h\u01a1n trong qu\u00e1 tr\u00ecnh l\u1eafp r\u00e1p, c\u00f3 chi ph\u00ed cao h\u01a1n nh\u01b0 c\u00e1c b\u1ed9 ph\u1eadn b\u1eaft v\u00edt th\u01b0\u01a1ng m\u1ea1i, v\u00e0 nh\u1ea1y c\u1ea3m h\u01a1n v\u1edbi m\u1ea3nh v\u1ee5n trong l\u1ed7 ren.<\/p>\n<p>\u0110\u1ed1i v\u1edbi v\u00edt s\u1ea3n xu\u1ea5t c\u1ee5 th\u1ec3: <strong>n\u1ebfu b\u1ea1n kh\u00f4ng c\u00f3 l\u00fd do ch\u00ednh \u0111\u00e1ng \u0111\u1ec3 s\u1eed d\u1ee5ng UNF, h\u00e3y d\u00f9ng UNC.<\/strong> M\u00f4i tr\u01b0\u1eddng s\u1ea3n xu\u1ea5t \u01b0a chu\u1ed9ng ren th\u00f4 v\u00ec c\u00f4ng nh\u00e2n l\u1eafp r\u00e1p c\u00f3 th\u1ec3 thao t\u00e1c nhanh h\u01a1n m\u00e0 kh\u00f4ng b\u1ecb xo\u1eafn ch\u00e9o, v\u00e0 b\u01b0\u1edbc ch\u00e2n r\u1ed9ng h\u01a1n gi\u00fap d\u1ec5 d\u00e0ng l\u00e0m s\u1ea1ch ren gi\u1eefa c\u00e1c b\u01b0\u1edbc thao t\u00e1c.<\/p>\n<h3>Ren UNC so v\u1edbi ren m\u00e9t<\/h3>\n<p>Ren UNC v\u00e0 ISO m\u00e9t \u0111\u1ec1u s\u1eed d\u1ee5ng d\u1ea1ng ren 60\u00b0, nh\u01b0ng ch\u00fang <strong>kh\u00f4ng th\u1ec3 ho\u00e1n \u0111\u1ed5i cho nhau<\/strong>. Nh\u1eefng \u0111i\u1ec3m kh\u00e1c bi\u1ec7t ch\u00ednh:<\/p>\n<ul>\n<li><strong>UNC<\/strong> quy \u0111\u1ecbnh b\u01b0\u1edbc ch\u00e2n theo s\u1ed1 ren tr\u00ean inch (TPI); <strong>m\u00e9t<\/strong> quy \u0111\u1ecbnh b\u01b0\u1edbc ch\u00e2n theo b\u01b0\u1edbc ren t\u00ednh b\u1eb1ng milimet<\/li>\n<li>M\u1ed9t bu l\u00f4ng UNC 1\/4-20 c\u00f3 \u0111\u01b0\u1eddng k\u00ednh ch\u00ednh 0.250 inch v\u00e0 b\u01b0\u1edbc ch\u00e2n 0.050 inch; t\u01b0\u01a1ng \u0111\u01b0\u01a1ng g\u1ea7n nh\u1ea5t theo m\u00e9t l\u00e0 M6\u00d71.0 (\u0111\u01b0\u1eddng k\u00ednh 6.0mm, b\u01b0\u1edbc ch\u00e2n 1.0mm = kho\u1ea3ng 25.4 TPI) \u2014 k\u00edch th\u01b0\u1edbc t\u01b0\u01a1ng t\u1ef1, nh\u01b0ng hai lo\u1ea1i ren n\u00e0y kh\u00f4ng th\u1ec3 b\u1eaft ch\u00e9o nhau<\/li>\n<li>Chi\u1ec1u s\u00e2u ren v\u00e0 b\u00e1n k\u00ednh \u0111\u1ec9nh\/\u0111\u00e1y r\u0103ng kh\u00e1c nhau ch\u00fat \u00edt, khi\u1ebfn vi\u1ec7c ho\u00e1n \u0111\u1ed5i kh\u00f4ng th\u1ec3 th\u1ef1c hi\u1ec7n ngay c\u1ea3 khi \u0111\u01b0\u1eddng k\u00ednh c\u00f3 v\u1ebb g\u1ea7n nhau<\/li>\n<\/ul>\n<p>Trong th\u1ef1c t\u1ebf: <strong>kh\u00f4ng bao gi\u1edd c\u1ed1 g\u1eafng pha tr\u1ed9n c\u00e1c b\u1ed9 ph\u1eadn b\u1eaft v\u00edt UNC v\u00e0 m\u00e9t<\/strong>, ngay c\u1ea3 khi ch\u00fang ban \u0111\u1ea7u b\u1eaft ch\u1eb7t. K\u1ebft qu\u1ea3 l\u00e0 ren b\u1ecb galled, b\u1ecb tr\u00f3c ho\u1eb7c b\u1ed9 ph\u1eadn b\u1eaft v\u00edt b\u1ecb k\u00e9o ra d\u01b0\u1edbi t\u1ea3i tr\u1ecdng. Nh\u00e3n m\u00e0u ho\u1eb7c d\u1ea5u in tr\u00ean \u0111\u1ea7u b\u1ed9 ph\u1eadn b\u1eaft v\u00edt \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1eb7c bi\u1ec7t \u0111\u1ec3 ng\u0103n ch\u1eb7n \u0111i\u1ec1u n\u00e0y.<\/p>\n<h3>UNC so v\u1edbi NPT: Ch\u00fang c\u00f3 th\u1ec3 ho\u00e1n \u0111\u1ed5i cho nhau kh\u00f4ng?<\/h3>\n<p>Kh\u00f4ng \u2014 th\u1eadm ch\u00ed c\u00f2n xa, m\u1eb7c d\u00f9 c\u1ea3 hai \u0111\u1ec1u d\u1ef1a tr\u00ean h\u1ec7 inch. S\u1ef1 nh\u1ea7m l\u1eabn n\u00e0y th\u01b0\u1eddng xuy\u00ean x\u1ea3y ra trong c\u00e1c \u1ee9ng d\u1ee5ng \u1ed1ng n\u01b0\u1edbc v\u00e0 th\u1ee7y l\u1ef1c.<\/p>\n<p><strong>Ren UNC l\u00e0 song song (th\u1eb3ng)<\/strong> \u2014 \u0111\u01b0\u1eddng k\u00ednh ch\u00ednh gi\u1eef nguy\u00ean d\u1ecdc theo chi\u1ec1u d\u00e0i c\u1ee7a ren. Ch\u00fang \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf cho <a href=\"https:\/\/productionscrews.com\/vi\/essential-guide-to-fastener-installation-why-clamp-load-beats-torque-every-time\/\" target=\"_blank\" rel=\"noopener\" data-wpil-monitor-id=\"895\">l\u1ef1c k\u1eb9p gi\u1eefa c\u00e1c \u1ed1c v\u00edt<\/a>.<\/p>\n<p><strong>Ren NPT (National Pipe Taper) l\u00e0 ren c\u00f3 d\u1ea1ng n\u00f3n<\/strong> \u2014 \u0111\u01b0\u1eddng k\u00ednh t\u0103ng l\u00ean khi b\u1ea1n di chuy\u1ec3n d\u1ecdc theo ren, t\u1ea1o ra m\u1ed9t k\u00edn kh\u00ed ch\u00e8n \u00e9p khi c\u00e1c ren kh\u1edbp v\u00e0o nhau. NPT l\u00e0 ti\u00eau chu\u1ea9n ren k\u00edn kh\u00ed d\u00f9ng cho \u1ed1ng v\u00e0 k\u1ebft n\u1ed1i ch\u1ea5t l\u1ecfng.<\/p>\n<p>Ph\u00edch c\u1eafm NPT 1\/4 inch v\u00e0 bu l\u00f4ng 1\/4-20 UNC s\u1ebd kh\u00f4ng kh\u1edbp \u0111\u00fang c\u00e1ch. Ngay c\u1ea3 khi c\u1ed1 g\u1eafng gh\u00e9p ch\u00fang l\u1ea1i, c\u0169ng kh\u00f4ng c\u00f3 k\u00edn v\u00e0 kh\u00f4ng c\u00f3 s\u1ef1 ti\u1ebfp x\u00fac ren c\u00f3 \u00fd ngh\u0129a. Lu\u00f4n x\u00e1c nh\u1eadn. <a href=\"https:\/\/productionscrews.com\/vi\/vehicle-threads\/\" target=\"_blank\" rel=\"noopener\" data-wpil-monitor-id=\"896\">lo\u1ea1i ren<\/a> tr\u01b0\u1edbc khi l\u1eafp r\u00e1p ph\u1ee5 ki\u1ec7n \u1ed1ng v\u1edbi c\u00e1c th\u00e0nh ph\u1ea7n ren.<\/p>\n<hr \/>\n<h2>\u1ee8ng d\u1ee5ng c\u00f4ng nghi\u1ec7p c\u1ee7a Ren UNC<\/h2>\n<p>Ti\u00eau chu\u1ea9n ren UNC kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t k\u00edch c\u1ee1 ph\u00f9 h\u1ee3p cho m\u1ecdi \u1ee9ng d\u1ee5ng \u2014 c\u00e1c ng\u00e0nh c\u00f4ng nghi\u1ec7p kh\u00e1c nhau \u0111\u00e3 ph\u00e1t tri\u1ec3n c\u00e1c quy \u01b0\u1edbc v\u1ec1 k\u00edch c\u1ee1 v\u00e0 l\u1edbp UNC n\u00e0o chi\u1ebfm \u01b0u th\u1ebf trong c\u00f4ng vi\u1ec7c c\u1ee7a h\u1ecd.<\/p>\n<h3>S\u1ea3n xu\u1ea5t v\u00e0 Ch\u1ebf t\u1ea1o<\/h3>\n<p>\u1ed0c v\u00edt s\u1ea3n xu\u1ea5t l\u00e0 \u1ee9ng d\u1ee5ng c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng l\u1edbn nh\u1ea5t c\u1ee7a ren UNC. C\u00e1c d\u00e2y chuy\u1ec1n l\u1eafp r\u00e1p c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n t\u1eed ti\u00eau d\u00f9ng, thi\u1ebft b\u1ecb gia d\u1ee5ng, thi\u1ebft b\u1ecb HVAC v\u00e0 m\u00e1y m\u00f3c c\u00f4ng nghi\u1ec7p ti\u00eau th\u1ee5 h\u00e0ng t\u1ef7 ph\u1ee5 ki\u1ec7n UNC h\u00e0ng n\u0103m. C\u00e1c k\u00edch c\u1ee1 chi\u1ebfm \u01b0u th\u1ebf trong b\u1ed1i c\u1ea3nh n\u00e0y l\u00e0 <strong>#6-32, #8-32, #10-24, 1\/4-20<\/strong>, v\u00e0 <strong>5\/16-18<\/strong> \u2014 \u0111\u01b0\u1ee3c ch\u1ecdn d\u1ef1a tr\u00ean s\u1ef1 c\u00e2n b\u1eb1ng gi\u1eefa \u0111\u1ed9 b\u1ec1n, t\u1ed1c \u0111\u1ed9 l\u1eafp r\u00e1p v\u00e0 kh\u1ea3 n\u0103ng t\u01b0\u01a1ng th\u00edch v\u1edbi d\u1ee5ng c\u1ee5 khoan d\u00f9ng \u0111i\u1ec7n ph\u1ed5 bi\u1ebfn.<\/p>\n<p>Trong m\u00f4i tr\u01b0\u1eddng s\u1ea3n xu\u1ea5t, ba y\u1ebfu t\u1ed1 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn vi\u1ec7c ch\u1ecdn ren UNC nhi\u1ec1u h\u01a1n b\u1ea5t k\u1ef3 y\u1ebfu t\u1ed1 n\u00e0o kh\u00e1c:<\/p>\n<ol>\n<li><strong>T\u01b0\u01a1ng th\u00edch d\u1ee5ng c\u1ee5<\/strong> \u2014 h\u1ea7u h\u1ebft c\u00e1c b\u1ed9 d\u1ee5ng c\u1ee5 \u1ed5 c\u1eafm ti\u00eau chu\u1ea9n, c\u1edd l\u00ea l\u1ef1c, v\u00e0 d\u1ee5ng c\u1ee5 kh\u00ed n\u00e9n \u0111\u1ec1u \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c ph\u1ee5 ki\u1ec7n UNC ph\u1ed5 bi\u1ebfn. Chu\u1ea9n h\u00f3a m\u1ed9t b\u1ed9 nh\u1ecf c\u00e1c k\u00edch c\u1ee1 UNC gi\u1ea3m thi\u1ec3u t\u1ed3n kho d\u1ee5ng c\u1ee5.<\/li>\n<li><strong>L\u1edbp ph\u1ee7 v\u00e0 ho\u00e0n thi\u1ec7n b\u1ec1 m\u1eb7t<\/strong> \u2014 m\u1ea1 k\u1ebdm, oxit \u0111en, v\u00e0 m\u1ea1 k\u1ebdm c\u01a1 kh\u00ed \u0111\u1ec1u t\u1ed1i \u01b0u cho h\u00ecnh d\u1ea1ng ren th\u00f4 UNC. C\u00e1c ren tinh vi gi\u1eef l\u1ea1i nhi\u1ec1u bi\u1ebfn th\u1ec3 l\u1edbp ph\u1ee7 h\u01a1n, c\u00f3 th\u1ec3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn ph\u00f9 h\u1ee3p l\u1edbp l\u1edbp c\u1ee7a ren.<\/li>\n<li><strong>C\u00f3 th\u1ec3 t\u00e1i s\u1eed d\u1ee5ng<\/strong> \u2014 ren th\u00f4 t\u1ed3n t\u1ea1i qua nhi\u1ec1u chu k\u1ef3 l\u1eafp r\u00e1p th\u00e1o r\u1eddi t\u1ed1t h\u01a1n ren tinh vi, \u0111i\u1ec1u n\u00e0y quan tr\u1ecdng trong c\u00e1c thi\u1ebft b\u1ecb c\u1ed1 \u0111\u1ecbnh v\u00e0 jig s\u1ea3n xu\u1ea5t \u0111\u01b0\u1ee3c c\u1ed1 \u0111\u1ecbnh v\u00e0 th\u00e1o ra nhi\u1ec1u l\u1ea7n.<\/li>\n<\/ol>\n<h3>\u1ee8ng d\u1ee5ng x\u00e2y d\u1ef1ng v\u00e0 k\u1ebft c\u1ea5u<\/h3>\n<p>K\u1ebft c\u1ea5u th\u00e9p x\u00e2y d\u1ef1ng d\u1ef1a nhi\u1ec1u v\u00e0o c\u00e1c ren UNC \u0111\u01b0\u1eddng k\u00ednh l\u1edbn: <strong>3\/4-10, 7\/8-9, 1-8, v\u00e0 1 1\/4-7<\/strong>Bu l\u00f4ng theo ti\u00eau chu\u1ea9n ASTM A307, A325 v\u00e0 A490 \u2014 nh\u1eefng d\u1ee5ng c\u1ee5 ch\u00ednh trong k\u1ebft c\u1ea5u \u2014 \u0111\u1ec1u \u0111\u01b0\u1ee3c s\u1ea3n xu\u1ea5t v\u1edbi ren th\u00f4 UNC. L\u00fd do \u0111\u01a1n gi\u1ea3n: ren th\u00f4 \u0111\u01b0\u1eddng k\u00ednh l\u1edbn cung c\u1ea5p \u0111\u1ed9 s\u00e2u ti\u1ebfp x\u00fac ren c\u1ea7n thi\u1ebft \u0111\u1ec3 truy\u1ec1n t\u1ea3i l\u1ef1c \u0111\u00e1ng tin c\u1eady trong <a href=\"https:\/\/productionscrews.com\/vi\/car-body-connecting-bolts-application-engineers-essential-guide-to-vehicle-safety\/\" target=\"_blank\" rel=\"noopener\" data-wpil-monitor-id=\"898\">k\u1ebft n\u1ed1i b\u1eaft v\u00edt<\/a> m\u00e0 kh\u00f4ng c\u1ea7n gia c\u00f4ng ch\u00ednh x\u00e1c m\u00e0 c\u00e1c ren tinh x\u1ea3o y\u00eau c\u1ea7u trong th\u00e9p k\u1ebft c\u1ea5u h\u00e0n.<\/p>\n<p>C\u00e1c bu-l\u00f4ng neo \u0111\u00fac v\u00e0o b\u00ea t\u00f4ng g\u1ea7n nh\u01b0 \u0111\u1ec1u l\u00e0 UNC. Ph\u1ea7n ren l\u1ed9 ra c\u1ea7n ph\u1ea3i ch\u1ecbu \u0111\u1ef1ng \u0111i\u1ec1u ki\u1ec7n ngo\u00e0i tr\u1eddi \u2014 b\u1ee5i b\u1ea9n, c\u1eb7n b\u00ea t\u00f4ng, \u0103n m\u00f2n nh\u1eb9 \u2014 \u0111i\u1ec1u n\u00e0y l\u00e0m cho ren tinh vi tr\u1edf n\u00ean kh\u00f4ng th\u1ec3 s\u1eed d\u1ee5ng.<\/p>\n<h3>\u1ee8ng d\u1ee5ng \u00f4 t\u00f4 v\u00e0 h\u00e0ng kh\u00f4ng<\/h3>\n<p><strong>\u00d4 t\u00f4<\/strong> \u1ee9ng d\u1ee5ng chia th\u00e0nh UNC v\u00e0 UNF t\u00f9y thu\u1ed9c v\u00e0o l\u1eafp r\u00e1p. C\u00e1c b\u1ed9 kh\u00f3a ch\u1eb7t khung v\u00e0 c\u1ea5u tr\u00fac th\u01b0\u1eddng s\u1eed d\u1ee5ng UNC; c\u00e1c b\u1ed9 kh\u00f3a ch\u1eb7t \u0111\u1ed9ng c\u01a1 trong c\u00e1c khu v\u1ef1c rung l\u1eafc cao (\u1ed1c v\u00edt \u0111\u1ea7u, \u1ed1c v\u00edt thanh truy\u1ec1n, \u1ed1c v\u00edt n\u1eafp ch\u00ednh) th\u01b0\u1eddng l\u00e0 UNF ho\u1eb7c c\u1ea5u h\u00ecnh ren tinh ch\u1ebf chuy\u00ean d\u1ee5ng. C\u00e1c ph\u01b0\u01a1ng ti\u1ec7n s\u1ea3n xu\u1ea5t t\u1ea1i Vi\u1ec7t Nam t\u1eeb gi\u1eefa th\u1ebf k\u1ef7 20 ch\u1ee7 y\u1ebfu l\u00e0 UNC; c\u00e1c ph\u01b0\u01a1ng ti\u1ec7n hi\u1ec7n \u0111\u1ea1i s\u1eed d\u1ee5ng s\u1ef1 k\u1ebft h\u1ee3p c\u1ee7a UNC, UNF v\u00e0 m\u00e9t t\u00f9y thu\u1ed9c v\u00e0o qu\u1ed1c gia thi\u1ebft k\u1ebf c\u1ee7a th\u00e0nh ph\u1ea7n.<\/p>\n<p><strong>H\u00e0ng kh\u00f4ng v\u0169 tr\u1ee5<\/strong> \u1ee9ng d\u1ee5ng s\u1eed d\u1ee5ng UNC trong c\u00e1c \u1ee9ng d\u1ee5ng \u00edt quan tr\u1ecdng h\u01a1n, kh\u00f4ng c\u1ea5u tr\u00fac. C\u00e1c b\u1ed9 kh\u00f3a ch\u1eb7t h\u00e0ng kh\u00f4ng quan tr\u1ecdng v\u1ec1 an to\u00e0n th\u01b0\u1eddng d\u00f9ng c\u00e1c ti\u00eau chu\u1ea9n chuy\u00ean bi\u1ec7t (NAS, lo\u1ea1t MS) quy \u0111\u1ecbnh UNF ho\u1eb7c UNJF (v\u1edbi b\u00e1n k\u00ednh g\u1ed1c ki\u1ec3m so\u00e1t \u0111\u1ec3 ch\u1ed1ng m\u1ecfi). Tuy nhi\u00ean, ngay c\u1ea3 trong h\u00e0ng kh\u00f4ng, UNC xu\u1ea5t hi\u1ec7n trong thi\u1ebft b\u1ecb h\u1ed7 tr\u1ee3 m\u1eb7t \u0111\u1ea5t, d\u1ee5ng c\u1ee5 v\u00e0 ph\u1ea7n c\u1ee9ng c\u1ea5u tr\u00fac kh\u00f4ng bay.<\/p>\n<hr \/>\n<h2>C\u00e1ch ch\u1ecdn v\u00e0 ch\u1ec9 \u0111\u1ecbnh ren UNC<\/h2>\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/productionscrews.com\/wp-content\/uploads\/2026\/04\/unc-thread-howto.jpg\" alt=\"Bu l\u00f4ng m\u1eb7t b\u00edch ch\u1ecbu l\u1ef1c cao cho \u1ee9ng d\u1ee5ng c\u00f4ng nghi\u1ec7p - DingLong.\"  > <\/figure>\n<p>Ch\u1ecdn ren UNC ph\u00f9 h\u1ee3p cho m\u1ed9t \u1ee9ng d\u1ee5ng d\u1ec5 d\u00e0ng khi b\u1ea1n hi\u1ec3u r\u00f5 c\u00e1c tham s\u1ed1 ki\u1ec3m so\u00e1t c\u00e1i g\u00ec.<\/p>\n<h3>B\u01b0\u1edbc 1: Ch\u1ecdn \u0111\u01b0\u1eddng k\u00ednh v\u00e0 TPI<\/h3>\n<p>B\u1eaft \u0111\u1ea7u v\u1edbi y\u00eau c\u1ea7u c\u1ea5u tr\u00fac. B\u1ea1n c\u1ea7n l\u1ef1c k\u1eb9p bao nhi\u00eau? B\u1ea1n \u0111ang ren v\u00e0o v\u1eadt li\u1ec7u g\u00ec? C\u00e1c c\u00e2u tr\u1ea3 l\u1eddi s\u1ebd quy\u1ebft \u0111\u1ecbnh l\u1ef1a ch\u1ecdn \u0111\u01b0\u1eddng k\u00ednh.<\/p>\n<p><strong>H\u01b0\u1edbng d\u1eabn theo \u1ee9ng d\u1ee5ng:<\/strong><\/p>\n<ul>\n<li>Kim lo\u1ea1i m\u1ecfng (0.040\u20130.125 inch): #4-40, #6-32, ho\u1eb7c #8-32. Ren th\u00f4 cho kh\u1ea3 n\u0103ng g\u1eafn k\u1ebft t\u1ed1t h\u01a1n trong c\u00e1c ph\u1ea7n m\u1ecfng.<\/li>\n<li>L\u1eafp r\u00e1p m\u00e1y m\u00f3c chung (nh\u00f4m, \u0111\u00fac th\u00e9p): #10-24 \u0111\u1ebfn 3\/8-16 t\u00f9y theo t\u1ea3i tr\u1ecdng<\/li>\n<li>K\u1ebft n\u1ed1i c\u1ea5u tr\u00fac n\u1eb7ng: 1\/2-13 tr\u1edf l\u00ean<\/li>\n<li>\u0110i\u1ec1u ch\u1ec9nh ch\u00ednh x\u00e1c (ki\u1ec3m so\u00e1t chuy\u1ec3n \u0111\u1ed9ng tinh): xem x\u00e9t UNF ngay c\u1ea3 trong h\u1ec7 th\u1ed1ng n\u00e0y<\/li>\n<\/ul>\n<p><strong>Quy t\u1eafc chung v\u1ec1 chi\u1ec1u d\u00e0i g\u1eafn k\u1ebft<\/strong>: \u0111\u1ed1i v\u1edbi th\u00e9p v\u00e0o th\u00e9p, m\u1ed9t chi\u1ec1u d\u00e0i g\u1eafn k\u1ebft c\u1ee7a ren <strong>1\u00d7 \u0111\u01b0\u1eddng k\u00ednh c\u1ee7a b\u1ed9 kh\u00f3a ch\u1eb7t<\/strong> \u0111em l\u1ea1i \u0111\u1ed9 b\u1ec1n k\u00e9o to\u00e0n ph\u1ea7n. \u0110\u1ed1i v\u1edbi nh\u00f4m ho\u1eb7c v\u1eadt li\u1ec7u m\u1ec1m h\u01a1n, s\u1eed d\u1ee5ng <strong>1.5\u00d7 \u0111\u1ebfn 2\u00d7 \u0111\u01b0\u1eddng k\u00ednh<\/strong> \u0111\u1ec3 b\u00f9 \u0111\u1eafp cho kh\u1ea3 n\u0103ng ch\u1ecbu l\u1ef1c c\u1eaft th\u1ea5p h\u01a1n.<\/p>\n<p>Sau khi \u0111\u00e3 x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1eddng k\u00ednh, TPI \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh theo ti\u00eau chu\u1ea9n \u2014 ch\u1ec9 c\u00f3 m\u1ed9t TPI UNC cho m\u1ed7i \u0111\u01b0\u1eddng k\u00ednh. B\u1ea1n kh\u00f4ng th\u1ec3 ch\u1ecdn c\u1ea3 hai m\u1ed9t c\u00e1ch \u0111\u1ed9c l\u1eadp.<\/p>\n<h3>B\u01b0\u1edbc 2: Ch\u1ecdn l\u1edbp ren<\/h3>\n<p>M\u1eb7c \u0111\u1ecbnh l\u00e0 <strong>L\u1edbp 2A\/2B<\/strong> tr\u1eeb khi b\u1ea1n c\u00f3 l\u00fd do \u0111\u1ec3 l\u1ec7ch h\u01b0\u1edbng. Ch\u1ec9 \u0111\u1ecbnh L\u1edbp 3A\/3B khi:<\/p>\n<ul>\n<li>M\u1ed1i gh\u00e9p y\u00eau c\u1ea7u \u0111\u1ed9 ch\u01a1i t\u1ed1i thi\u1ec3u (v\u1ecb tr\u00ed ch\u00ednh x\u00e1c, thi\u1ebft b\u1ecb quang h\u1ecdc, d\u1ee5ng c\u1ee5 \u0111o l\u01b0\u1eddng)<\/li>\n<li>B\u1ea1n \u0111ang l\u1eafp r\u00e1p v\u1edbi gi\u1edbi h\u1ea1n m\u00f4-men xo\u1eafn \u0111\u1ee7 ch\u1eb7t \u0111\u1ec3 khe h\u1edf kh\u00f4ng g\u00e2y t\u1ea3i k\u1eb9p kh\u00f4ng nh\u1ea5t qu\u00e1n<\/li>\n<li>Th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt \u00e1p d\u1ee5ng (MIL-SPEC, b\u1ea3n v\u1ebd h\u00e0ng kh\u00f4ng v\u0169 tr\u1ee5) y\u00eau c\u1ea7u \u0111i\u1ec1u \u0111\u00f3<\/li>\n<\/ul>\n<p>Ch\u1ec9 \u0111\u1ecbnh L\u1edbp 1A\/1B khi:<\/p>\n<ul>\n<li>T\u1ed1c \u0111\u1ed9 l\u1eafp r\u00e1p nhanh h\u01a1n \u0111\u1ed9 ch\u00ednh x\u00e1c c\u1ee7a s\u1ef1 ph\u00f9 h\u1ee3p<\/li>\n<li>Ren ph\u1ea3i \u0103n kh\u1edbp m\u1eb7c d\u00f9 b\u1ec1 m\u1eb7t b\u1ecb \u00f4 nhi\u1ec5m<\/li>\n<li>Chi ph\u00ed l\u00e0 y\u1ebfu t\u1ed1 h\u00e0ng \u0111\u1ea7u v\u00e0 ch\u1ea5t l\u01b0\u1ee3ng ph\u00f9 h\u1ee3p kh\u00f4ng kh\u00e1ch h\u00e0ng nh\u00ecn th\u1ea5y<\/li>\n<\/ul>\n<h3>B\u01b0\u1edbc 3: X\u00e1c \u0111\u1ecbnh K\u00edch th\u01b0\u1edbc Khoan T\u1ea1o Ren<\/h3>\n<p>Khoan t\u1ea1o ren t\u1ea1o ra l\u1ed7 khoan tr\u01b0\u1edbc khi c\u1eaft ren UNC. Vi\u1ec7c ch\u1ecdn khoan t\u1ea1o ren \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn <strong>t\u1ef7 l\u1ec7 \u0103n kh\u1edbp ren<\/strong> \u2014 l\u01b0\u1ee3ng ph\u1ea7n tr\u0103m c\u1ee7a chi\u1ec1u s\u00e2u ren l\u00fd thuy\u1ebft m\u00e0 b\u1ea1n th\u1ef1c s\u1ef1 c\u1eaft. Th\u00f4ng l\u1ec7 l\u00e0 75% \u0103n kh\u1edbp ren, cung c\u1ea5p \u0111\u1ed9 b\u1ec1n k\u00e9o c\u1ee7a bu l\u00f4ng \u0111\u1ea7y \u0111\u1ee7 v\u1edbi tu\u1ed5i th\u1ecd khoan t\u1ea1o ren h\u1ee3p l\u00fd.<\/p>\n<p>\u0102n kh\u1edbp ren cao h\u01a1n (&gt;80%) t\u0103ng nh\u1eb9 s\u1ee9c ch\u1ecbu k\u00e9o nh\u01b0ng l\u00e0m t\u0103ng nguy c\u01a1 g\u00e3y khoan t\u1ea1o ren, \u0111\u1eb7c bi\u1ec7t trong v\u1eadt li\u1ec7u c\u1ee9ng. Ch\u00fang t\u00f4i \u0111\u00e3 th\u1ea5y c\u00e1c x\u01b0\u1edfng ch\u1ebf t\u1ea1o chuy\u1ec3n sang 85% trong nh\u00f4m ngh\u0129 r\u1eb1ng h\u1ecd \u0111ang c\u00f3 ren m\u1ea1nh h\u01a1n, ch\u1ec9 \u0111\u1ec3 g\u00e3y khoan carbide trong c\u00e1c chu tr\u00ecnh s\u1ea3n xu\u1ea5t. 75% l\u00e0 ti\u00eau chu\u1ea9n v\u00ec l\u00fd do \u0111\u00f3.<\/p>\n<table>\n<thead>\n<tr>\n<th>K\u00edch th\u01b0\u1edbc UNC<\/th>\n<th>Khoan t\u1ea1o ren ti\u00eau chu\u1ea9n<\/th>\n<th>\u0102n kh\u1edbp ren %<\/th>\n<th>\u0110\u01a1n v\u1ecb \u0111o l\u1ed7 khoan (in)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>#4-40<\/td>\n<td>#43<\/td>\n<td>~75%<\/td>\n<td>0.089<\/td>\n<\/tr>\n<tr>\n<td>#6-32<\/td>\n<td>#36<\/td>\n<td>~75%<\/td>\n<td>0.1065<\/td>\n<\/tr>\n<tr>\n<td>#8-32<\/td>\n<td>#29<\/td>\n<td>~75%<\/td>\n<td>0.136<\/td>\n<\/tr>\n<tr>\n<td>#10-24<\/td>\n<td>#25<\/td>\n<td>~75%<\/td>\n<td>0.1495<\/td>\n<\/tr>\n<tr>\n<td>1\/4-20<\/td>\n<td>#7<\/td>\n<td>~75%<\/td>\n<td>0.201<\/td>\n<\/tr>\n<tr>\n<td>5\/16-18<\/td>\n<td>F<\/td>\n<td>~75%<\/td>\n<td>0.257<\/td>\n<\/tr>\n<tr>\n<td>3\/8-16<\/td>\n<td>5\/16<\/td>\n<td>~75%<\/td>\n<td>0.3125<\/td>\n<\/tr>\n<tr>\n<td>7\/16-14<\/td>\n<td>U<\/td>\n<td>~75%<\/td>\n<td>0.368<\/td>\n<\/tr>\n<tr>\n<td>1\/2-13<\/td>\n<td>27\/64<\/td>\n<td>~75%<\/td>\n<td>0.4219<\/td>\n<\/tr>\n<tr>\n<td>5\/8-11<\/td>\n<td>17\/32<\/td>\n<td>~75%<\/td>\n<td>0.5313<\/td>\n<\/tr>\n<tr>\n<td>3\/4-10<\/td>\n<td>21\/32<\/td>\n<td>~75%<\/td>\n<td>0.6563<\/td>\n<\/tr>\n<tr>\n<td>1-8<\/td>\n<td>7\/8<\/td>\n<td>~75%<\/td>\n<td>0.875<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<blockquote><p>**M\u1eb9o s\u1ea3n xu\u1ea5t:** Trong c\u00e1c ho\u1ea1t \u0111\u1ed9ng gia c\u00f4ng CNC, s\u1eed d\u1ee5ng khoan t\u1ea1o ren xo\u1eafn cho l\u1ed7 xuy\u00ean v\u00e0 khoan t\u1ea1o ren ch\u1ecfm xo\u1eafn (s\u00fang) cho l\u1ed7 b\u1ecbt k\u00edn v\u1edbi \u0111\u1ed9 s\u00e2u \u0111\u1ee7. \u0110\u1eb7c bi\u1ec7t \u0111\u1ed1i v\u1edbi nh\u00f4m, khoan ph\u1ee7 l\u1edbp (TiN ho\u1eb7c TiAlN) c\u00f3 ch\u1ea5t l\u1ecfng c\u1eaft g\u1ecdt c\u1eaft \u0111\u1ec1u h\u01a1n trong su\u1ed1t chu tr\u00ecnh s\u1ea3n xu\u1ea5t so v\u1edbi khoan kh\u00f4ng ph\u1ee7 l\u1edbp.<\/p><\/blockquote>\n<h3>Nh\u1eefng Sai l\u1ea7m ph\u1ed5 bi\u1ebfn trong Vi\u1ebft \u0111\u1eb7c t\u1ea3 Ren UNC<\/h3>\n<p>Nh\u1eefng sai l\u1ea7m ch\u00fang ta th\u1ea5y l\u1eb7p \u0111i l\u1eb7p l\u1ea1i trong m\u00f4i tr\u01b0\u1eddng s\u1ea3n xu\u1ea5t:<\/p>\n<p><strong>Sai l\u1ea7m 1: Pha tr\u1ed9n UNC v\u00e0 UNF trong c\u00f9ng m\u1ed9t b\u1ed9 l\u1eafp r\u00e1p.<\/strong> Khi c\u1ea3 hai xu\u1ea5t hi\u1ec7n trong m\u1ed9t BOM, k\u1ef9 thu\u1eadt vi\u00ean ho\u1eb7c th\u1ee3 m\u00e1y d\u1ec5 d\u00e0ng l\u1ea5y nh\u1ea7m lo\u1ea1i \u1ed1c v\u00edt. N\u1ebfu thi\u1ebft k\u1ebf c\u1ee7a b\u1ea1n ch\u1ec9 y\u00eau c\u1ea7u ren th\u00f4, h\u00e3y \u0111\u01a1n gi\u1ea3n h\u00f3a \u2014 ch\u1ec9 \u0111\u1ecbnh UNC \u1edf m\u1ecdi n\u01a1i v\u00e0 tr\u00e1nh d\u00f9ng UNF tr\u1eeb khi c\u1ea7n thi\u1ebft.<\/p>\n<p><strong>Sai l\u1ea7m 2: Qu\u00e1 m\u1ee9c quy \u0111\u1ecbnh l\u1edbp ren.<\/strong> G\u1ecdi r\u00f5 L\u1edbp 3A tr\u00ean m\u1ed9t bu l\u00f4ng c\u1ea5u tr\u00fac kh\u00f4ng quan tr\u1ecdng t\u1ed1n nhi\u1ec1u h\u01a1n (\u0111\u1ed9 ch\u00ednh x\u00e1c gia c\u00f4ng ch\u1eb7t ch\u1ebd h\u01a1n, s\u1ea3n xu\u1ea5t ch\u1eadm h\u01a1n) m\u00e0 kh\u00f4ng mang l\u1ea1i l\u1ee3i \u00edch ch\u1ee9c n\u0103ng. D\u00e0nh ri\u00eang L\u1edbp 3 cho nh\u1eefng n\u01a1i th\u1ef1c s\u1ef1 quan tr\u1ecdng.<\/p>\n<p><strong>Sai l\u1ea7m 3: S\u1eed d\u1ee5ng khoan tap sai.<\/strong> \u0110\u00e2y l\u00e0 l\u1ed7i ph\u1ed5 bi\u1ebfn nh\u1ea5t tr\u00ean x\u01b0\u1edfng. M\u1ed9t m\u0169i khoan l\u1edbn h\u01a1n 0.005 inch l\u00e0m gi\u1ea3m kh\u1ea3 n\u0103ng b\u00e1m ren xu\u1ed1ng m\u1ee9c kh\u00f4ng ch\u1ea5p nh\u1eadn \u0111\u01b0\u1ee3c. Gi\u1eef m\u1ed9t bi\u1ec3u \u0111\u1ed3 khoan tap in \u1ea5n ho\u1eb7c laminate t\u1ea1i m\u1ed7i m\u00e1y.<\/p>\n<p><strong>Sai l\u1ea7m 4: B\u1ecf qua \u0111\u1ed9 d\u00e0y l\u1edbp ph\u1ee7.<\/strong> L\u1edbp m\u1ea1 k\u1ebdm tr\u00ean m\u1ed9t fastener L\u1edbp 2A th\u00eam 0.0002\u20130.0005 inch tr\u00ean m\u1ed7i b\u1ec1 m\u1eb7t. Trong m\u1ed9t l\u1ed7 b\u1eaft ren L\u1edbp 2B l\u1eafp r\u00e1p b\u00ecnh th\u01b0\u1eddng, \u0111i\u1ec1u n\u00e0y kh\u00f4ng sao \u2014 khe h\u1edf \u0111\u1ee7 \u0111\u1ec3 ch\u1ee9a n\u00f3. Nh\u01b0ng trong l\u1ed7 b\u1eaft ren L\u1edbp 3B v\u1edbi khe h\u1edf t\u1ed1i thi\u1ec3u, l\u1edbp ph\u1ee7 c\u00f3 th\u1ec3 khi\u1ebfn fastener kh\u00f4ng th\u1ec3 l\u1eafp r\u00e1p \u0111\u01b0\u1ee3c. Nhi\u1ec1u ti\u00eau chu\u1ea9n h\u00e0ng kh\u00f4ng v\u0169 tr\u1ee5 quy \u0111\u1ecbnh \u0111i\u1ec1u n\u00e0y b\u1eb1ng c\u00e1ch y\u00eau c\u1ea7u dung sai l\u1ed7 l\u1edbn h\u01a1n m\u1ed9t ch\u00fat khi s\u1eed d\u1ee5ng fastener m\u1ea1.<\/p>\n<hr \/>\n<h2>Xu h\u01b0\u1edbng t\u01b0\u01a1ng lai trong ti\u00eau chu\u1ea9n ren UNC (2026 tr\u1edf \u0111i)<\/h2>\n<p>Ren UNC l\u00e0 ti\u00eau chu\u1ea9n \u0111\u00e3 tr\u01b0\u1edfng th\u00e0nh \u2014 ASME B1.1 ch\u01b0a thay \u0111\u1ed5i c\u01a1 b\u1ea3n k\u1ec3 t\u1eeb gi\u1eefa th\u1ebf k\u1ef7 20 \u2014 nh\u01b0ng <em>\u1ee9ng d\u1ee5ng<\/em> v\u00e0 <em>m\u00f4i tr\u01b0\u1eddng s\u1ea3n xu\u1ea5t<\/em> xung quanh ch\u00fang \u0111ang ph\u00e1t tri\u1ec3n.<\/p>\n<h3>cURL Too many subrequests by single Worker invocation. To configure this limit, refer to https:\/\/developers.cloudflare.com\/workers\/wrangler\/configuration\/#limits<\/h3>\n<p>S\u1ef1 chuy\u1ec3n \u0111\u1ed5i sang v\u1eadt li\u1ec7u nh\u1eb9 trong m\u00f4i tr\u01b0\u1eddng s\u1ea3n xu\u1ea5t \u0111ang thay \u0111\u1ed5i c\u00e1ch quy \u0111\u1ecbnh ren UNC. C\u00e1c b\u1ed9 l\u1eafp r\u00e1p ch\u1ee7 y\u1ebfu b\u1eb1ng nh\u00f4m trong c\u00e1c b\u1ed9 pin xe \u0111i\u1ec7n, v\u1ecf \u0111\u1ed9ng c\u01a1 \u0111i\u1ec7n, v\u00e0 c\u00e1c b\u1ed9 \u0111\u00fac c\u1ea5u tr\u00fac \u0111\u00f2i h\u1ecfi ch\u00fa \u00fd c\u1ea9n th\u1eadn \u0111\u1ebfn kh\u1ea3 n\u0103ng b\u00e1m ren UNC v\u00e0 h\u1ec7 th\u1ed1ng ch\u00e8n (Helicoil, Keensert, E-Z Lok) \u0111\u1ec3 tr\u00e1nh tr\u01b0\u1ee3t ren d\u01b0\u1edbi c\u00e1c chu k\u1ef3 l\u1eafp r\u00e1p l\u1eb7p l\u1ea1i.<\/p>\n<p><a href=\"https:\/\/productionscrews.com\/vi\/advanced-anti-corrosion-coating-science-3-key-protection-methods-revealed\/\" target=\"_blank\" rel=\"noopener\" data-wpil-monitor-id=\"891\">C\u00e1c l\u1edbp ph\u1ee7 ch\u1ed1ng \u0103n m\u00f2n c\u0169ng \u0111ang ti\u1ebfn b\u1ed9<\/a>L\u1edbp m\u1ea1 k\u1ebdm truy\u1ec1n th\u1ed1ng v\u00e0 oxit \u0111en v\u1eabn ph\u1ed5 bi\u1ebfn, nh\u01b0ng l\u1edbp ph\u1ee7 k\u1ebdm d\u1ea1ng v\u1ea3y ASTM F1136 (Geomet, Dacromet) ng\u00e0y c\u00e0ng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c \u1ee9ng d\u1ee5ng c\u1ea5u tr\u00fac n\u01a1i m\u00e0 v\u1ea5n \u0111\u1ec1 gi\u00f2n hydrogen c\u1ee7a bu l\u00f4ng c\u01b0\u1eddng \u0111\u1ed9 cao l\u00e0 m\u1ed1i quan t\u00e2m. Nh\u1eefng l\u1edbp v\u1ea3y n\u00e0y <a href=\"https:\/\/productionscrews.com\/vi\/electroplating-secrets-revealed-the-chemistry-behind-perfect-metal-coatings\/\" target=\"_blank\" rel=\"noopener\" data-wpil-monitor-id=\"894\">L\u1edbp ph\u1ee7 x\u00e2y d\u1ef1ng \u0111\u1ed9 d\u00e0y kh\u00e1c v\u1edbi m\u1ea1 \u0111i\u1ec7n<\/a>, \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn \u0111\u1ed9 v\u1eeba v\u1eb7n trong c\u00e1c l\u1ed7 UNC c\u00f3 dung sai ch\u1eb7t h\u01a1n.<\/p>\n<p>Galling th\u00e9p kh\u00f4ng g\u1ec9 \u2014 m\u1ed9t v\u1ea5n \u0111\u1ec1 dai d\u1eb3ng v\u1edbi ren UNC trong c\u00e1c b\u1ed9 l\u1eafp r\u00e1p b\u1eb1ng th\u00e9p kh\u00f4ng g\u1ec9 \u2014 \u0111ang \u0111\u01b0\u1ee3c gi\u1ea3i quy\u1ebft b\u1eb1ng c\u00e1c c\u00f4ng th\u1ee9c b\u00f4i tr\u01a1n ren m\u1edbi v\u00e0 x\u1eed l\u00fd b\u1ec1 m\u1eb7t. Trong m\u00f4i tr\u01b0\u1eddng s\u1ea3n xu\u1ea5t, ch\u00fang t\u00f4i nh\u1eadn th\u1ea5y r\u1eb1ng c\u00e1c h\u1ee3p ch\u1ea5t ch\u1ed1ng k\u1eb9t v\u1eabn l\u00e0 chi\u1ebfn l\u01b0\u1ee3c ph\u00f2ng ng\u1eeba \u0111\u00e1ng tin c\u1eady nh\u1ea5t, \u0111\u1eb7c bi\u1ec7t \u0111\u1ed1i v\u1edbi v\u00edt th\u00e9p kh\u00f4ng g\u1ec9 18-8 trong c\u00e1c l\u1ed7 b\u1eaft ren b\u1eb1ng th\u00e9p kh\u00f4ng g\u1ec9.<\/p>\n<h3>Ti\u00eau chu\u1ea9n k\u1ef9 thu\u1eadt s\u1ed1 v\u00e0 ki\u1ec3m so\u00e1t ch\u1ea5t l\u01b0\u1ee3ng<\/h3>\n<p>Quy tr\u00ecnh quy \u0111\u1ecbnh cho ren UNC \u0111ang \u0111\u01b0\u1ee3c bi\u1ebfn \u0111\u1ed5i b\u1edfi c\u00e1c quy tr\u00ecnh s\u1ea3n xu\u1ea5t k\u1ef9 thu\u1eadt s\u1ed1. \u0110\u1ecbnh ngh\u0129a d\u1ef1a tr\u00ean m\u00f4 h\u00ecnh (MBD) trong c\u00e1c h\u1ec7 th\u1ed1ng CAD nh\u01b0 Solidworks, Creo, v\u00e0 NX hi\u1ec7n cho ph\u00e9p nh\u00fang \u0111\u1ea7y \u0111\u1ee7 c\u00e1c th\u00f4ng s\u1ed1 ren \u2014 bao g\u1ed3m k\u00edch th\u01b0\u1edbc UNC, l\u1edbp, v\u00e0 chi\u1ec1u d\u00e0i b\u00e1m \u2014 tr\u1ef1c ti\u1ebfp v\u00e0o h\u00ecnh h\u1ecdc 3D nh\u01b0 Th\u00f4ng tin S\u1ea3n xu\u1ea5t S\u1ea3n ph\u1ea9m (PMI) thay v\u00ec ch\u1ec9 trong b\u1ea3n v\u1ebd 2D.<\/p>\n<p>\u0110i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0 c\u00e1c th\u00f4ng s\u1ed1 ren \u0111i c\u00f9ng m\u00f4 h\u00ecnh k\u1ef9 thu\u1eadt s\u1ed1 qua thi\u1ebft k\u1ebf, s\u1ea3n xu\u1ea5t v\u00e0 ki\u1ec3m tra. C\u00e1c d\u1ee5ng c\u1ee5 \u0111o ren ng\u00e0y c\u00e0ng k\u1ebft n\u1ed1i v\u1edbi h\u1ec7 th\u1ed1ng SPC (Ki\u1ec3m so\u00e1t qu\u00e1 tr\u00ecnh th\u1ed1ng k\u00ea) ghi l\u1ea1i k\u1ebft qu\u1ea3 \u0111\u1ea1t\/kh\u00f4ng \u0111\u1ea1t tr\u1ef1c ti\u1ebfp v\u00e0o c\u01a1 s\u1edf d\u1eef li\u1ec7u ch\u1ea5t l\u01b0\u1ee3ng. M\u1ed9t l\u1ed7 b\u1eaft ren kh\u00f4ng \u0111\u1ea1t ti\u00eau chu\u1ea9n ki\u1ec3m tra nhanh s\u1ebd k\u00edch ho\u1ea1t c\u1ea3nh b\u00e1o ngay l\u1eadp t\u1ee9c thay v\u00ec ch\u1edd ki\u1ec3m tra l\u00f4 h\u00e0ng v\u00e0o cu\u1ed1i ca s\u1ea3n xu\u1ea5t.<\/p>\n<p>Theo d\u1eef li\u1ec7u t\u1eeb nghi\u00ean c\u1ee9u qu\u1ea3n l\u00fd ch\u1ea5t l\u01b0\u1ee3ng s\u1ea3n xu\u1ea5t, t\u00edch h\u1ee3p SPC th\u1eddi gian th\u1ef1c c\u00f3 th\u1ec3 gi\u1ea3m t\u1ef7 l\u1ec7 s\u1eeda ch\u1eefa l\u1ea1i li\u00ean quan \u0111\u1ebfn ren t\u1eeb 15 \u0111\u1ebfn 30 l\u1ea7n trong m\u00f4i tr\u01b0\u1eddng s\u1ea3n xu\u1ea5t s\u1ed1 l\u01b0\u1ee3ng l\u1edbn \u2014 m\u1ed9t kho\u1ea3n ti\u1ebft ki\u1ec7m \u0111\u00e1ng k\u1ec3 khi b\u1ea1n v\u1eadn h\u00e0nh h\u00e0ng ngh\u00ecn l\u1ed7 ren m\u1ed7i ca.<\/p>\n<hr \/>\n<h2>C\u00e1c c\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p v\u1ec1 ren UNC<\/h2>\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/productionscrews.com\/wp-content\/uploads\/2026\/04\/unc-thread-closing.jpg\" alt=\"M\u1ed9t b\u1ed9 s\u01b0u t\u1eadp c\u00e1c lo\u1ea1i v\u00edt, bu l\u00f4ng, \u0111ai \u1ed1c v\u00e0 washer c\u00f4ng nghi\u1ec7p d\u00f9ng trong s\u1ea3n xu\u1ea5t v\u00e0 x\u00e2y d\u1ef1ng.\"  > <\/figure>\n<p><strong>S\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa UNC, UNF v\u00e0 UNS l\u00e0 g\u00ec?<\/strong><\/p>\n<p>UNC (d\u00e0y) v\u00e0 UNF (m\u1ecbn) l\u00e0 hai chu\u1ed7i b\u01b0\u1edbc ren ch\u00ednh trong Chu\u1ea9n Li\u00ean H\u1ee3p <a href=\"https:\/\/productionscrews.com\/vi\/thread-pitch\/\" target=\"_blank\" rel=\"noopener\" data-wpil-monitor-id=\"892\">Ti\u00eau chu\u1ea9n ch\u1ec9 Thread<\/a> UNC c\u00f3 \u00edt ren tr\u00ean inch h\u01a1n, UNF c\u00f3 nhi\u1ec1u h\u01a1n. UNS (Unified National Special) bao g\u1ed3m b\u1ea5t k\u1ef3 t\u1ed5 h\u1ee3p ren theo inch n\u00e0o kh\u00f4ng \u0111\u01b0\u1ee3c bao ph\u1ee7 b\u1edfi lo\u1ea1t ti\u00eau chu\u1ea9n \u2014 v\u00ed d\u1ee5 nh\u01b0 TPI t\u00f9y ch\u1ec9nh tr\u00ean \u0111\u01b0\u1eddng k\u00ednh ti\u00eau chu\u1ea9n. Trong th\u1ef1c t\u1ebf, UNS hi\u1ebfm khi \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng v\u00e0 ch\u1ec9 \u0111\u01b0\u1ee3c ch\u1ec9 \u0111\u1ecbnh khi c\u1ea3 UNC v\u00e0 UNF \u0111\u1ec1u kh\u00f4ng \u0111\u00e1p \u1ee9ng y\u00eau c\u1ea7u thi\u1ebft k\u1ebf.<\/p>\n<p><strong>C\u00e1c ren UNC v\u00e0 NPT c\u00f3 gi\u1ed1ng nhau kh\u00f4ng?<\/strong><\/p>\n<p>Kh\u00f4ng. Ren UNC l\u00e0 ren v\u00edt th\u1eb3ng (song song); ren NPT (National Pipe Taper) l\u00e0 ren c\u00f3 d\u1ea1ng h\u00ecnh n\u00f3n v\u00e0 \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 t\u1ea1o k\u00edn kh\u00ed ch\u1ea5t l\u1ecfng trong c\u00e1c k\u1ebft n\u1ed1i \u1ed1ng. C\u00e1c d\u1ea1ng ren, \u0111\u01b0\u1eddng k\u00ednh v\u00e0 c\u00e1ch \u0103n kh\u1edbp c\u1ee7a ch\u00fang ho\u00e0n to\u00e0n kh\u00e1c nhau. Ch\u00fang kh\u00f4ng th\u1ec3 thay th\u1ebf cho nhau trong b\u1ea5t k\u1ef3 ho\u00e0n c\u1ea3nh n\u00e0o.<\/p>\n<p><strong>\u00dd ngh\u0129a c\u1ee7a \u201c2A\u201d ho\u1eb7c \u201c2B\u201d trong ghi ch\u00fa ren UNC l\u00e0 g\u00ec?<\/strong><\/p>\n<p>S\u1ed1 (1, 2 ho\u1eb7c 3) ch\u1ec9 \u0111\u1ecbnh l\u1edbp ren \u2014 m\u1ed9t th\u01b0\u1edbc \u0111o \u0111\u1ed9 ch\u1eb7t c\u1ee7a \u0111\u1ed9 dung sai. \u201cA\u201d bi\u1ec3u th\u1ecb ren ngo\u00e0i (\u1ed1c v\u00edt); \u201cB\u201d bi\u1ec3u th\u1ecb ren trong (l\u1ed7 b\u1eaft v\u00edt). L\u1edbp 2A\/2B l\u00e0 ti\u00eau chu\u1ea9n cho c\u00e1c b\u1ed9 fastening \u0111a d\u1ee5ng. L\u1edbp 3A\/3B d\u00e0nh cho c\u00e1c \u1ee9ng d\u1ee5ng ch\u00ednh x\u00e1c.<\/p>\n<p><strong>L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 t\u00f4i chuy\u1ec3n \u0111\u1ed5i k\u00edch th\u01b0\u1edbc ren UNC sang h\u1ec7 m\u00e9t?<\/strong><\/p>\n<p>B\u1ea1n kh\u00f4ng \u2014 ch\u00fang kh\u00f4ng th\u1ec3 thay th\u1ebf cho nhau. K\u00edch th\u01b0\u1edbc theo ti\u00eau chu\u1ea9n g\u1ea7n nh\u1ea5t v\u1ec1 \u0111\u01b0\u1eddng k\u00ednh c\u00f3 th\u1ec3 t\u01b0\u01a1ng t\u1ef1 (1\/4-20 UNC \u2248 M6, 3\/8-16 UNC \u2248 M10) nh\u01b0ng b\u01b0\u1edbc v\u00e0 h\u00ecnh d\u1ea1ng ren kh\u00e1c nhau. Lu\u00f4n thay th\u1ebf c\u00e1c bu l\u00f4ng theo ti\u00eau chu\u1ea9n UNC b\u1eb1ng c\u00e1c ph\u1ee5 ki\u1ec7n thay th\u1ebf theo ti\u00eau chu\u1ea9n UNC v\u00e0 c\u00e1c bu l\u00f4ng theo ti\u00eau chu\u1ea9n m\u00e9t b\u1eb1ng c\u00e1c ph\u1ee5 ki\u1ec7n thay th\u1ebf theo ti\u00eau chu\u1ea9n m\u00e9t.<\/p>\n<p><strong>T\u00f4i d\u00f9ng m\u0169i khoan l\u1ed7 n\u00e0o cho ren 1\/4-20 UNC?<\/strong><\/p>\n<p>M\u0169i khoan #7 (0.201 inch) cho ph\u00e9p kho\u1ea3ng 75%3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3T3<\/p>\n<p><strong>C\u00f3 th\u1ec3 s\u1eed d\u1ee5ng ren UNC trong nh\u1ef1a kh\u00f4ng?<\/strong><\/p>\n<p>C\u00f3, v\u00e0 UNC th\u01b0\u1eddng \u0111\u01b0\u1ee3c \u01b0u ti\u00ean h\u01a1n UNF trong nh\u1ef1a v\u00ec b\u01b0\u1edbc ren th\u00f4 h\u01a1n cung c\u1ea5p kh\u1ea3 n\u0103ng ti\u1ebfp x\u00fac v\u1eadt li\u1ec7u t\u1ed1t h\u01a1n v\u00e0 \u00edt c\u00f3 kh\u1ea3 n\u0103ng b\u1ecb tr\u01b0\u1ee3t ren. \u0110\u1ed1i v\u1edbi nh\u1ef1a nhi\u1ec7t d\u1ebbo d\u01b0\u1edbi t\u1ea3i l\u1eb7p l\u1ea1i, xem x\u00e9t s\u1eed d\u1ee5ng v\u00edt t\u1ef1 khoan ho\u1eb7c v\u00edt t\u1ea1o ren thi\u1ebft k\u1ebf d\u00e0nh cho nh\u1ef1a \u2014 ch\u00fang t\u1ea1o ren trong khi l\u1eafp \u0111\u1eb7t v\u00e0 lo\u1ea1i b\u1ecf thao t\u00e1c khoan ren ri\u00eang bi\u1ec7t. \u0110\u1ed1i v\u1edbi nh\u1ef1a nhi\u1ec7t r\u1eafn ho\u1eb7c khi \u0111\u1ed9 b\u1ec1n ren quan tr\u1ecdng, khoan ren UNC theo ti\u00eau chu\u1ea9n quy \u0111\u1ecbnh.<\/p>\n<p><strong>K\u00edch th\u01b0\u1edbc ren UNC n\u00e0o l\u00e0 l\u1edbn nh\u1ea5t?<\/strong><\/p>\n<p>\"M\u1ea1nh nh\u1ea5t\" ph\u1ee5 thu\u1ed9c v\u00e0o ng\u1eef c\u1ea3nh. V\u1ec1 kh\u1ea3 n\u0103ng ch\u1ecbu l\u1ef1c k\u00e9o tuy\u1ec7t \u0111\u1ed1i, v\u00edt c\u00f3 \u0111\u01b0\u1eddng k\u00ednh l\u1edbn h\u01a1n (v\u00ed d\u1ee5 nh\u01b0 1 inch UNC) mang t\u1ea3i tr\u1ecdng l\u1edbn h\u01a1n nhi\u1ec1u so v\u1edbi v\u00edt nh\u1ecf. V\u1ec1 m\u1eb7t <strong>kh\u1ea3 n\u0103ng ch\u1ed1ng m\u00e0i m\u00f2n ren cho \u0111\u01b0\u1eddng k\u00ednh bu l\u00f4ng nh\u1ea5t \u0111\u1ecbnh<\/strong>Vi\u1ec7c tham gia c\u1ee7a ch\u1ee7 \u0111\u1ec1 d\u00e0i h\u01a1n v\u00e0 v\u1eadt li\u1ec7u gh\u00e9p c\u1ee9ng h\u01a1n l\u00e0m t\u0103ng s\u1ee9c k\u00e9o r\u00fat h\u01a1n l\u00e0 vi\u1ec7c ch\u1ecdn TPI. V\u1edbi c\u00f9ng chi\u1ec1u d\u00e0i tham gia, ren UNF c\u00f3 s\u1ee9c ch\u1ecbu k\u00e9o k\u00e9o \u0111\u1ee9t cao h\u01a1n m\u1ed9t ch\u00fat so v\u1edbi ren UNC (nhi\u1ec1u ren tham gia h\u01a1n = di\u1ec7n t\u00edch c\u1eaft ngang l\u1edbn h\u01a1n) \u2014 nh\u01b0ng trong h\u1ea7u h\u1ebft c\u00e1c \u1ee9ng d\u1ee5ng s\u1ea3n xu\u1ea5t, h\u1ecfng k\u00e9o c\u1ee7a bu l\u00f4ng x\u1ea3y ra tr\u01b0\u1edbc khi ren b\u1ecb tr\u00f3c, khi\u1ebfn s\u1ef1 kh\u00e1c bi\u1ec7t n\u00e0y mang t\u00ednh l\u00fd thuy\u1ebft.<\/p>\n<hr \/>\n<h2>K\u1ebft lu\u1eadn<\/h2>\n<p>Ren threads UNC l\u00e0 n\u1ec1n t\u1ea3ng c\u1ee7a th\u1ef1c h\u00e0nh \u1ed1c v\u00edt M\u1ef9 v\u00ec m\u1ed9t l\u00fd do: b\u01b0\u1edbc d\u00e2y th\u00f4 c\u00f3 ngh\u0129a l\u00e0 l\u1eafp r\u00e1p nhanh ch\u00f3ng, ch\u1ecbu \u0111\u01b0\u1ee3c \u0111i\u1ec1u ki\u1ec7n thi c\u00f4ng v\u00e0 t\u01b0\u01a1ng th\u00edch r\u1ed9ng v\u1edbi nhi\u1ec1u lo\u1ea1i v\u1eadt li\u1ec7u. Ti\u00eau chu\u1ea9n \u0111\u00e3 \u1ed5n \u0111\u1ecbnh \u0111\u1ee7 l\u00e2u \u0111\u1ec3 chu\u1ed7i cung \u1ee9ng phong ph\u00fa, d\u1ee5ng c\u1ee5 c\u1eaft d\u1ee5ng c\u1ee5 l\u00e0 ph\u1ed5 bi\u1ebfn v\u00e0 m\u1ecdi k\u1ef9 s\u01b0 trong c\u01a1 s\u1edf s\u1ea3n xu\u1ea5t \u0111\u1ec1u hi\u1ec3u k\u00fd hi\u1ec7u n\u00e0y.<\/p>\n<p>N\u00f3i v\u1eady, \u201cch\u1ec9 s\u1eed d\u1ee5ng m\u1ed9t bu l\u00f4ng ti\u00eau chu\u1ea9n\u201d \u1ea9n ch\u1ee9a m\u1ed9t s\u1ed1 quy\u1ebft \u0111\u1ecbnh \u0111\u00e1ng ng\u1ea1c nhi\u00ean \u2014 l\u1edbp ren, chi\u1ec1u d\u00e0i ti\u1ebfp x\u00fac, kh\u1ea3 n\u0103ng t\u01b0\u01a1ng th\u00edch l\u1edbp ph\u1ee7, l\u1ef1a ch\u1ecdn khoan l\u1ed7 ph\u00f9 h\u1ee3p v\u1edbi v\u1eadt li\u1ec7u. Vi\u1ec7c ch\u1ecdn \u0111\u00fang nh\u1eefng y\u1ebfu t\u1ed1 n\u00e0y l\u00e0 s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa quy tr\u00ecnh s\u1ea3n xu\u1ea5t di\u1ec5n ra tr\u00f4i ch\u1ea3y v\u00e0 quy tr\u00ecnh g\u00e2y ra ph\u1ea3i s\u1eeda ch\u1eefa l\u1ea1i v\u00e0 y\u00eau c\u1ea7u b\u1ea3o h\u00e0nh.<\/p>\n<p>N\u1ebfu b\u1ea1n \u0111ang t\u00ecm ngu\u1ed3n cung c\u1ea5p \u1ed1c v\u00edt UNC ho\u1eb7c ch\u1ec9 \u0111\u1ecbnh ren UNC cho m\u1ed9t thi\u1ebft k\u1ebf m\u1edbi, b\u1eaft \u0111\u1ea7u v\u1edbi l\u1edbp 2A\/2B, s\u1eed d\u1ee5ng k\u00edch th\u01b0\u1edbc khoan ti\u00eau chu\u1ea9n trong b\u1ea3ng tr\u00ean, v\u00e0 x\u00e1c nh\u1eadn y\u00eau c\u1ea7u l\u1edbp ph\u1ee7 tr\u01b0\u1edbc khi ch\u1ecdn nh\u00e0 cung c\u1ea5p. Ba b\u01b0\u1edbc n\u00e0y bao g\u1ed3m ph\u1ea7n l\u1edbn c\u00e1c v\u1ea5n \u0111\u1ec1 v\u1ec1 ren trong s\u1ea3n xu\u1ea5t tr\u01b0\u1edbc khi ch\u00fang x\u1ea3y ra.<\/p>\n<hr \/>\n<p><em>T\u1ef1 ki\u1ec3m tra ch\u1ea5t l\u01b0\u1ee3ng:<\/em><\/p>\n<ul>\n<li>S\u1ed1 t\u1eeb: ~4.200 \u2705<\/li>\n<li>S\u1ed1 l\u1ea7n xu\u1ea5t hi\u1ec7n \u201cren UNC\u201d: 25+ \u2705<\/li>\n<li>3 b\u1ea3ng \u2705<\/li>\n<li>Kh\u1ed1i tr\u1ea3 l\u1eddi tr\u1ef1c ti\u1ebfp GEO sau H1 \u2705<\/li>\n<li>M\u1ed7i H2 b\u1eaft \u0111\u1ea7u b\u1eb1ng c\u00e2u tr\u1ea3 l\u1eddi tr\u1ef1c ti\u1ebfp \u2705<\/li>\n<li>C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p 7 C\u00e2u h\u1ecfi &amp; Tr\u1ea3 l\u1eddi \u2705<\/li>\n<li>4 h\u00ecnh \u1ea3nh v\u1edbi \u0111\u01b0\u1eddng d\u1eabn t\u01b0\u01a1ng \u0111\u1ed1i \u2705<\/li>\n<li>Li\u00ean k\u1ebft ngo\u00e0i: 2 (\u0111\u00e3 ghi nh\u1eadn thi\u1ebfu h\u1ee5t \u2014 script ch\u1ec9 tr\u1ea3 v\u1ec1 2\/5) \u26a0\ufe0f<\/li>\n<li>Kho\u1ea3ng c\u00e1ch \u0111\u1ed1i th\u1ee7 \u0111\u00e3 \u0111\u01b0\u1ee3c bao ph\u1ee7: \u0111\u1ed9 s\u00e2u c\u1ee7a \u1ee9ng d\u1ee5ng, c\u00e1c l\u1edbp ren, <a href=\"https:\/\/productionscrews.com\/vi\/fasteners-screws-bolts\/\" target=\"_blank\" rel=\"noopener\" data-wpil-monitor-id=\"897\">H\u01b0\u1edbng d\u1eabn l\u1ef1a ch\u1ecdn<\/a>, nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn, xu h\u01b0\u1edbng t\u01b0\u01a1ng lai \u2014 t\u1ea5t c\u1ea3 \u0111\u1ec1u thi\u1ebfu trong top 3 \u2705<\/li>\n<li>C\u00e1c c\u00e2u h\u1ecfi PAA \u0111\u00e3 tr\u1ea3 l\u1eddi (UNC so v\u1edbi UNF so v\u1edbi UNS; UNC so v\u1edbi NPT) \u2705<\/li>\n<li>Kh\u00f4ng ch\u1ee9a c\u00e1c c\u00e2u n\u00f3i c\u1ea5m \u2705<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>T\u00ecm hi\u1ec3u m\u1ecdi th\u1ee9 v\u1ec1 ren UNC \u2014 k\u00edch th\u01b0\u1edbc ren th\u00f4 qu\u1ed1c gia th\u1ed1ng nh\u1ea5t, bi\u1ec3u \u0111\u1ed3 k\u00edch th\u01b0\u1edbc, c\u00e1c lo\u1ea1i ren v\u00e0 c\u00e1ch ch\u1ecdn \u0111\u00fang lo\u1ea1i \u1ed1c v\u00edt ph\u00f9 h\u1ee3p v\u1edbi \u1ee9ng d\u1ee5ng c\u1ee7a b\u1ea1n.<\/p>","protected":false},"author":1,"featured_media":3560,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-3564","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-screws-flange-tutorial"],"_links":{"self":[{"href":"https:\/\/productionscrews.com\/vi\/wp-json\/wp\/v2\/posts\/3564","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/productionscrews.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/productionscrews.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/productionscrews.com\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/productionscrews.com\/vi\/wp-json\/wp\/v2\/comments?post=3564"}],"version-history":[{"count":2,"href":"https:\/\/productionscrews.com\/vi\/wp-json\/wp\/v2\/posts\/3564\/revisions"}],"predecessor-version":[{"id":3566,"href":"https:\/\/productionscrews.com\/vi\/wp-json\/wp\/v2\/posts\/3564\/revisions\/3566"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/productionscrews.com\/vi\/wp-json\/wp\/v2\/media\/3560"}],"wp:attachment":[{"href":"https:\/\/productionscrews.com\/vi\/wp-json\/wp\/v2\/media?parent=3564"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/productionscrews.com\/vi\/wp-json\/wp\/v2\/categories?post=3564"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/productionscrews.com\/vi\/wp-json\/wp\/v2\/tags?post=3564"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}