When should I use DIN913 over DIN914?

Use DIN913 (flat point) on hardened shafts or when you do not want a permanent indent on the shaft surface. Use DIN914 (cone point) when you need a stronger grip and can accept a small indent.

What size range is offered?

M2 through M24, lengths 3 mm to 60 mm; custom lengths on request.

What grades do you stock?

Carbon steel 45H and 14.9, plus stainless steel A2-70 and A4-70. Black oxide is the most common finish.

Will DIN913 hold under vibration?

On its own, the flat point relies entirely on the clamp force. For vibration-prone joints, use thread-locker or a knurled-point DIN916.

Do you offer DIN913 in inch sizes?

We can quote inch-equivalent ISO 4026 sizes — please specify in your enquiry.

DIN913 Flat Point Set Screw Manufacturer

Name: DIN 913 Flat Point Set Screw
Brand: DingLong Hardware
SKU: DIN913
Availability: InStock

DIN913 hexagon socket set screws (grub screws) with flat point — M1.6 to M24, carbon steel hardness class 45H, stainless A2/A4, and nylon. ISO 4026 equivalent. EN 10204 3.1 certificates supplied. ISO 9001:2015 certified.

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Quotation Response

DIN913 Set Screw Quick Specifications

Standard

DIN913 / ISO 4026

Thread Size

M1.6 – M24

Point Type

Flat (non-damaging)

Hardness

45H / A2-70 / A4-70

What Is a DIN913 Set Screw?

DIN913 is a headless hexagon socket set screw with a flat point, also commonly called a grub screw or Allen set screw. Unlike standard cap screws, DIN913 is fully threaded with no head — it sits flush with or below the workpiece surface, driven by a hex key (Allen key) inserted into the socket at the top.

The flat point (smooth disc end) is the defining feature: it contacts the mating surface without biting in or scoring it. This makes DIN913 the preferred choice for hard surfaces, frequent adjustments, and assemblies where the mating component must remain undamaged.

Key technical characteristics:

Fully threaded body — entirely thread-engaged, no unthreaded shank
Driven by hex key (Allen key) via recessed socket
Hardness class 45H for carbon steel: min. 45 HRC surface, 33–39 HRC core
Product grade A per DIN EN ISO 4759-1
ISO equivalent: ISO 4026 (dimensionally identical)

See our full range of socket screws and set screws →

DIN913 vs DIN914 vs DIN915 vs DIN916 — Point Type Comparison

All four standards share the same hex socket headless body — they differ only in the end (point) shape. Choosing the correct point type is critical: the wrong choice can damage mating surfaces, reduce holding force, or make future disassembly impossible.

Feature	DIN913 Flat Point	DIN914 Cone Point	DIN915 Dog Point	DIN916 Cup Point
ISO Equivalent	ISO 4026	ISO 4027	ISO 4028	ISO 4029
End Shape	Flat, smooth disc	Tapered sharp cone	Protruding cylinder pin	Concave cup / ring
Surface Damage Risk	Minimal	High (pierces)	None (pre-drilled hole)	Moderate (ring mark)
Locking Mechanism	Friction / pressure	Cone digs in	Pin in hole — precision	Cup rim grips
Reusability	High	Low–Medium	High	Medium
Best For	Hard surfaces, frequent adjustment	Soft metals, one-time lock	Precise axial location	General locking, shaft collars
Common Applications	Jigs, fixtures, stops	Set-once shaft lock	Gear hubs, shaft locating	Pulleys, collars, handles

Quick rule: When the mating surface must not be damaged — choose DIN913. When maximum grip with no concern for surface marks — choose DIN916. For precision pin location — choose DIN915.

DIN913 Full Dimensions Table (M1.6 – M24)

Per DIN913 / ISO 4026. dp = flat point diameter. s = hex socket AF (Allen key size).
t = minimum socket engagement depth (short / long screws). All dimensions in mm.

Thread d	Pitch P (mm)	dp max (mm)	dp min (mm)	Socket e min (mm)	Hex s nom (mm) — Allen key	t short min (mm)	t long min (mm)
M1.6	0.35	0.80	0.55	0.809	0.7	0.7	1.5
M2	0.40	1.00	0.75	1.011	0.9	0.8	1.7
M2.5	0.45	1.50	1.25	1.454	1.3	1.2	2.0
M3	0.50	2.00	1.75	1.733	1.5	1.2	2.0
M4	0.70	2.50	2.25	2.303	2	1.5	2.5
M5	0.80	3.50	3.20	2.873	2.5	2.0	3.0
M6	1.00	4.00	3.70	3.443	3	2.0	3.5
M8	1.25	5.50	5.20	4.583	4	3.0	5.0
M10	1.50	7.00	6.64	5.723	5	4.0	6.0
M12	1.75	8.50	8.14	6.863	6	4.8	8.0
(M14)	2.00	10.00	9.64	6.863	6	5.6	9.0
M16	2.00	12.00	11.57	9.149	8	6.4	10.0
(M18)	2.50	13.00	12.57	11.429	10	7.2	11.0
M20	2.50	15.00	14.57	11.429	10	8.0	12.0
(M22)	2.50	17.00	16.57	13.716	12	9.0	13.5
M24	3.00	18.00	17.57	13.716	12	10.0	15.0

Sizes in parentheses (M14, M18, M22) are non-preferred per ISO 4026; availability may be limited. dp = flat point diameter. s = hex socket AF (Allen key size). t = socket depth (short/long screws). Hardness class 45H: min 45 HRC surface, 33–39 HRC core.

Materials & Hardness Grades

DIN913 uses hardness classes — not the 8.8/10.9 bolt grade system. Class 45H is standard for carbon steel set screws (min. 45 HRC surface hardness). Stainless grades use the A-class system (A2-70, A4-70).

Material	Grade	Best For
Carbon Steel	45H	General mechanical assembly, jigs, fixtures
Carbon Steel — Black Oxide	45H	Tooling, aesthetic finish, mild corrosion resistance
Stainless A2 (304)	A2-70	Food equipment, light corrosion, reusability
Stainless A4 (316)	A4-70	Marine, chemical, outdoor exposure
Plastic (Nylon / PVDF)	—	Non-marring, electrical insulation, soft mating surfaces

For plastic set screws, specify: Nylon DIN913 M6 × 12 — no grade needed.

Key Applications

✔ Locking shaft collars and hubs against axial movement
✔ Adjustable stop screws in jigs and fixtures
✔ Retaining knobs, handles, and levers on shafts
✔ Position locking in linear guides and slides
✔ Electronics: securing potentiometers and rotary controls
✔ CNC machine tooling: component registration stops
✔ Furniture fittings: invisible connector locking
✔ Hydraulic / pneumatic: needle valve adjustment retention

How to Install DIN913 Set Screws Correctly

Step 1 — Select the Correct Hex Key Size

Match the hex key (Allen key) to the s value in the dimensions table. For example: M6 uses a 3mm hex key, M8 uses 4mm, M10 uses 5mm. Use a T-handle or L-key with the long arm for full torque transfer. Low-quality hex keys with rounded corners can strip the socket — invest in quality tool steel keys.

Step 2 — Thread Engagement Depth

Minimum recommended engagement depth: 1× the thread diameter. For example, M8 should thread in at least 8mm into the tapped hole. For vibrating assemblies: use 1.5× diameter engagement. Always verify thread engagement before applying final torque.

Step 3 — Apply Correct Tightening Torque

Recommended indicative torques for DIN913 flat point set screws:

Size	45H Carbon (Nm)	A2/A4 Stainless (Nm)
M6	4.8	3.8–4.1
M8	12	9.6–10.2
M10	24	19.2–20.4
M12	40	32–34

Reduce stainless torque 15–20% to prevent galling. Values are indicative — verify with assembly engineer.

Step 4 — Apply Thread Locking Compound If Needed

For vibrating environments: apply medium-strength threadlocker (e.g. Loctite 243) to screw threads before installation. This prevents back-off under vibration without permanent locking. Do not use thread locking compound with plastic/nylon set screws — the chemical may attack the nylon material. Ensure the mating thread is clean and free of cutting fluid before applying locking compound.

How to Order DIN913 — Specification Format

Use the standard designation format when placing orders to avoid confusion:

Set Screw DIN913 – M8 × 20 – 45H

M8 — nominal thread diameter (in mm)
20 — nominal length in mm (= total screw length, since DIN913 has no head)
45H — hardness class (carbon steel). For stainless: use A2 or A4

Stainless example: Set Screw DIN913 – M8 × 20 – A2

Note: nominal length equals total screw length for DIN913. Unlike cap screws (where length excludes head), the headless DIN913 length IS the full length.

DIN913 or DIN916 — Quick Selection Guide

→ Surface must not be damaged → Choose DIN913 (flat point)
→ Stronger grip needed, surface impression acceptable → Choose DIN916 (cup point)
→ Precise axial pin location required → Choose DIN915 (dog point)
→ One-time installation in soft metal, maximum grip → Choose DIN914 (cone point)

Quality Certifications & Documentation

Every DIN913 set screw order ships with full traceability documentation.

ISO 9001:2015

Certified QMS covering DIN913 production, inspection, and delivery.

EN 10204 3.1 Certificates

Full material test certificates for every batch — chemistry and mechanical properties.

SGS Third-Party Testing

Independent hardness and tensile verification available on request.

RoHS Compliant Materials

Black oxide and zinc-plated finishes comply with EU RoHS 2011/65/EU.

Why Source DIN913 Set Screws From Us?

We manufacture DIN913 flat point set screws using precision CNC thread rolling with full ISO 4759 tolerance control. Each batch undergoes hex socket depth, hardness, and thread gauge inspection. No middlemen — direct factory pricing with complete documentation.

Stock: M4–M20 in 45H and A2-70 — ready in 3–5 business days
Custom: M1.6–M24, any length, 45H / A2 / A4 / Nylon, MOQ 500 pcs
CNC thread rolling, ISO 4759 tolerances, 100% hex socket depth checked
EN 10204 3.1 material certificates included with every order
Surface options: plain, black oxide, zinc plated, A4 passivated
OEM packaging: custom labelling, reel/bag/box, export-ready
Quote turnaround: 24 hours standard / 48 hours specials
Save 25–35% vs European distributor pricing on comparable DIN grades

Related Fastener Standards

DIN914 Cone Point Set Screw

Tapered cone bites into shaft — for one-time locking.

DIN915 Dog Point Set Screw

Protruding pin for precise axial location in drilled hole.

DIN916 Cup Point Set Screw

Cup rim grips shaft surface — most common set screw.

DIN938 Double End Stud Bolt

Metric tap-end stud bolts, b1=1d, M3–M52.

Need DIN913 Set Screws in Bulk or Custom Specifications?

We supply DIN913 flat point set screws in carbon steel 45H, stainless A2/A4, and nylon. Sizes M1.6–M24, custom lengths available. MOQ from 500 pcs. RoHS-compliant materials and EN 10204 3.1 certificates available on all orders.

Frequently Asked Questions — DIN913 Set Screws

Technical questions about DIN913 flat point set screw selection, ordering, installation, and standards.

What is the difference between DIN913 and DIN916?

DIN913 has a flat smooth point that does not damage the mating surface, making it ideal for hard surfaces and frequent adjustments. DIN916 has a concave cup point whose rim bites into the contact surface, providing stronger resistance to rotation but leaving a ring impression. DIN916 is the most commonly-used set screw for general shaft locking; DIN913 is preferred where surface integrity must be preserved.

What is hardness class 45H for DIN913?

45H means the set screw has a minimum surface hardness of 45 HRC and a core hardness of 33–39 HRC. This is specific to set screws and is not equivalent to bolt grades (8.8/10.9). The high surface hardness ensures the flat point can resist compressive loads without deforming.

Can DIN913 be used on aluminum or plastic components?

Yes, and it is one of the best choices for soft materials because the flat point does not pierce or score the surface (unlike DIN914 cone point). For non-marring requirements, plastic (nylon) DIN913 set screws are available in M4–M24 for zero surface damage.

What is the ISO equivalent of DIN913?

DIN913 corresponds to ISO 4026 (hexagon socket set screws with flat point). Both standards are dimensionally identical. Note that ISO 4026 omits non-preferred sizes M14, M18, and M22 that appear in the DIN designation range.

How do I choose the right length for a DIN913 set screw?

The set screw length should allow at least 1x the thread diameter of engagement in the threaded hole (1.5x for vibrating applications). The flat point end should contact the mating shaft without the screw protruding on the entry side. For through-hole locking, match screw length to the through-hole depth.

What Allen key size does DIN913 M8 use?

DIN913 M8 uses a 4mm hex key (Allen key) — the ‘s’ value from the dimension table. Always use a quality T-handle or L-key with the long arm for full torque control. The recommended tightening torque for M8 DIN913 in hardness class 45H is approximately 12 Nm.

What is the lead time for DIN913 set screws?

Standard stock sizes (M4–M20 in 45H and A2-70) ship within 3–5 business days. Custom sizes, A4-70 grade, black oxide finish, or nylon variants require 5–10 business days. Express production available for urgent orders — contact our sales team.

Do you provide quality certificates with DIN913 orders?

Yes. All orders include EN 10204 3.1 material test certificates covering chemical composition and mechanical properties. ISO 9001:2015 quality management certification applies to all production. SGS third-party test reports and RoHS compliance declarations are available on request.