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Russian DIN915 Dog Point Set Screw Manufacturer
DIN915 hexagon socket set screws (grub screws) with dog point — M1.6 to M24, carbon steel hardness class 45H, stainless A2/A4, and nylon. ISO 4028 equivalent. Half dog and full dog variants. EN 10204 3.1 certificates supplied. ISO 9001:2015 certified.
- M1.6–M24 · Half Dog & Full Dog Variants
- Hardness Class 45H (min 45 HRC surface) / A2-70 / A4-70 / Nylon
- ISO 4028 equivalent — DIN915 Dog Point (precise axial location)
- Lead Time: 3–5 Days (Stock) / 5–10 Days (Custom)
- EN 10204 3.1 Certificates · RoHS Compliant Options
What Is a DIN915 Dog Point Set Screw?
DIN915 is a headless hexagon socket set screw with a dog point — a protruding cylindrical pin (the “dog”) machined concentrically at the end of the screw. Also called a grub screw with pin point or Allen set screw with cylindrical end.
The pin engages a matching pre-drilled hole in the mating shaft or component, providing positive axial location — not just friction clamping. This makes DIN915 the correct choice wherever a component must be positioned at an exact axial position on a shaft and held there reliably under load.
Key technical characteristics:
- Fully threaded headless body — driven by hex key (Allen key)
- Concentric cylindrical dog pin at the tip — requires pre-drilled hole
- Hardness class 45H: min. 45 HRC surface, 33–39 HRC core
- ISO equivalent: ISO 4028 (dimensionally identical)
- Two pin length variants: half dog (short z) and full dog (long z)
Half Dog vs Full Dog Point
The variant is determined automatically by the screw nominal length you order — not a separate product. The threshold length for each size is shown in the dimension table.
① Half Dog Point (Short z)
Applied when screw nominal length L ≤ threshold (see table). The pin length z is shorter — suits shallow pre-drilled holes and space-constrained assemblies. Example: M8 × 12 mm → half dog (L ≤ 16 mm).
② Full Dog Point (Long z)
Applied when screw nominal length L > threshold. The pin length z is longer — deeper hole engagement, higher axial load capacity, better vibration resistance. Example: M8 × 20 mm → full dog (L > 16 mm).
DIN915 Full Dimensions Table (M1.6 – M24)
Per DIN915 / ISO 4028. dp = dog point (pin) diameter. z = dog pin length (short = half dog; long = full dog). s = hex socket AF (Allen key size). t = minimum hex socket engagement depth. Pre-drill H8 = recommended clearance hole for the dog pin. All dimensions in mm.
| Thread d |
Pitch P (mm) |
dp max (mm) |
dp min (mm) |
z short Half Dog (mm) |
z long Full Dog (mm) |
s nom (Allen key mm) |
e min (mm) |
t short min (mm) |
t long min (mm) |
Pre-drill H8 (mm) |
Half Dog when L ≤ |
|---|---|---|---|---|---|---|---|---|---|---|---|
| M1.6 | 0.35 | 0.80 | 0.55 | 0.8 | 1.2 | 0.7 | 0.809 | 0.7 | 1.0 | 0.8 | ≤3mm |
| M2 | 0.40 | 1.00 | 0.75 | 1.0 | 1.6 | 0.9 | 1.011 | 0.9 | 1.2 | 1.0 | ≤4mm |
| M2.5 | 0.45 | 1.50 | 1.25 | 1.25 | 2.0 | 1.3 | 1.454 | 1.2 | 1.7 | 1.5 | ≤5mm |
| M3 | 0.50 | 2.00 | 1.75 | 1.5 | 2.5 | 1.5 | 1.733 | 1.5 | 2.0 | 2.0 | ≤6mm |
| M4 | 0.70 | 2.50 | 2.25 | 2.0 | 3.0 | 2.0 | 2.303 | 1.5 | 2.5 | 2.5 | ≤8mm |
| M5 | 0.80 | 3.50 | 3.20 | 2.5 | 4.0 | 2.5 | 2.873 | 2.0 | 3.0 | 3.5 | ≤10mm |
| M6 | 1.00 | 4.00 | 3.70 | 3.0 | 5.0 | 3.0 | 3.443 | 2.5 | 3.5 | 4.0 | ≤12mm |
| M8 | 1.25 | 5.50 | 5.20 | 4.0 | 6.5 | 4.0 | 4.583 | 3.0 | 5.0 | 5.5 | ≤16mm |
| M10 | 1.50 | 7.00 | 6.64 | 5.0 | 8.0 | 5.0 | 5.723 | 4.0 | 6.0 | 7.0 | ≤20mm |
| M12 | 1.75 | 8.50 | 8.14 | 6.0 | 10.0 | 6.0 | 6.863 | 4.8 | 8.0 | 8.5 | ≤25mm |
| (M14) | 2.00 | 10.00 | 9.64 | 7.0 | 11.0 | 6.0 | 6.863 | 5.6 | 9.0 | 10.0 | ≤28mm |
| M16 | 2.00 | 12.00 | 11.57 | 8.0 | 13.0 | 8.0 | 9.149 | 6.4 | 10.0 | 12.0 | ≤32mm |
| (M18) | 2.50 | 13.00 | 12.57 | 9.0 | 14.5 | 10.0 | 11.429 | 7.2 | 11.0 | 13.0 | ≤36mm |
| M20 | 2.50 | 15.00 | 14.57 | 10.0 | 16.0 | 10.0 | 11.429 | 8.0 | 12.0 | 15.0 | ≤40mm |
| (M22) | 2.50 | 17.00 | 16.57 | 11.0 | 17.5 | 12.0 | 13.716 | 9.0 | 13.5 | 17.0 | ≤45mm |
| M24 | 3.00 | 18.00 | 17.57 | 12.0 | 19.0 | 12.0 | 13.716 | 10.0 | 15.0 | 18.0 | ≤48mm |
Sizes in parentheses (M14, M18, M22) are non-preferred per ISO; availability may vary. dp = dog point (pin) diameter. z = dog pin length (short = half dog; long = full dog). Half dog applies automatically when screw length L is at or below the threshold shown. Pre-drill H8 = recommended clearance hole diameter for the dog pin. All dimensions in mm. Hardness class 45H: min 45 HRC surface, 33–39 HRC core.
How to Pre-Drill for DIN915
Step 1 — Determine the Dog Pin Diameter (dp)
Read the dp max value from the dimension table for your screw size. This is the nominal dog pin diameter. For M8 DIN915: dp max = 5.50 mm.
Step 2 — Drill the Hole to H8 Tolerance
Use the Pre-drill H8 column for the target diameter. Drill with a twist drill, then ream to H8 tolerance for a precision fit. A snug H8 clearance fit ensures positive location without binding or slop. Avoid H7 (too tight — risk of seizure) and H9+ (too loose — location error).
Step 3 — Set the Hole Depth
Hole depth = z (dog pin length) + 0.5–1 mm clearance at the bottom. This allows the pin to seat fully without the screw thread bottoming out. For M8 full dog (z = 6.5 mm): drill to at least 7.5 mm depth.
Step 4 — Install and Torque
Thread the DIN915 screw into the tapped hole in the outer component. Advance until the dog pin enters the pre-drilled hole in the shaft. Apply final torque: M8 ≈ 12 Nm (45H carbon steel), reduce 15–20% for stainless. The pin now provides axial position lock — the screw threads provide clamping force.
DIN913 vs DIN914 vs DIN915 vs DIN916
All four DIN set screw standards share the same headless hex socket body — they differ only in the point (end) shape. Choosing the wrong standard is the most common procurement error in set screw selection.
| 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 cylindrical pin | Concave cup ring |
| Mating Shaft | Any flat or smooth | Any (bites in) | Pre-drilled hole required | Any shaft surface |
| Surface Damage Risk | Minimal | High (pierces) | None (pin in hole) | Moderate (ring mark) |
| Axial Location Precision | Low | Medium | High (pin-in-hole) | Low |
| Reusability | High | Low–Medium | High | Medium |
| Best For | Hard surfaces, no damage | Soft metals, one-time lock | Precision axial location | General shaft locking |
Materials & Hardness Grades
DIN915 uses hardness class 45H for carbon steel — not the 8.8/10.9 bolt grade system. The 45H designation specifies min. 45 HRC surface hardness so the dog pin withstands compressive loads inside the hole without permanent deformation. Stainless grades use the A-class system (A2-70, A4-70).
| Material | Grade | Best For |
|---|---|---|
| Carbon Steel | 45H | General mechanical assembly, gear hubs, CNC fixtures |
| Carbon Steel — Black Oxide | 45H | Tooling, aesthetic finish, mild corrosion resistance |
| Stainless A2 (304) | A2-70 | Food equipment, reusable assemblies, light corrosion |
| Stainless A4 (316) | A4-70 | Marine, chemical, outdoor exposure environments |
| Plastic (Nylon / PVDF) | — | Non-marring, electrical insulation, soft mating surfaces |
For plastic set screws, specify: Nylon DIN915 M6 × 12 — no grade suffix needed.
Key Applications
- ✔ Gear hubs — axial location of gears on drive shafts
- ✔ Precision CNC fixtures — component registration stops
- ✔ Shaft collars & couplings — indexed positioning
- ✔ Cams and eccentric discs — angular and axial registration
- ✔ Encoder and resolver mounting — position retention under vibration
- ✔ Jig and fixture tooling — repeatable datum location
- ✔ Pulleys and sprockets — drive-shaft axial lock
- ✔ Medical device assemblies — non-permanent, re-adjustable
How to Order DIN915 — Specification Format
Use the standard designation when placing orders to specify the correct variant:
Set Screw DIN915 – M8 × 20 – 45H
- M8 — nominal thread diameter (in mm)
- 20 — nominal length in mm (= total screw length; L > 16 mm for M8 → full dog automatically)
- 45H — hardness class (carbon steel). For stainless: use A2 or A4
Stainless example: Set Screw DIN915 – M8 × 12 – A2 (L=12 mm ≤ 16 mm → half dog applied automatically)
Note: You do not specify “half dog” or “full dog” separately — the point variant is determined by the nominal length per the standard. Our technical team can advise on length selection to achieve the required dog variant.
DIN915 vs Other Set Screw Standards — Quick Guide
Frequently Asked Questions — DIN915 Dog Point Set Screws
Technical answers on DIN915 dog point set screw selection, pre-drill sizing, half dog vs full dog, and ordering.
Need DIN915 Dog Point Set Screws in Bulk or Custom Sizes?
We supply DIN915 dog point set screws in carbon steel 45H, stainless A2/A4, and nylon. M1.6–M24, half dog and full dog, custom lengths available. MOQ from 500 pcs. EN 10204 3.1 certificates and RoHS-compliant materials on all orders.
Related Fastener Standards
DIN913 Flat Point Set Screw
Flat smooth point — no surface damage, ideal for frequent adjustment.
DIN914 Cone Point Set Screw
Tapered cone point bites into shaft — for one-time permanent locking.
DIN916 Cup Point Set Screw
Concave cup rim grips shaft surface — most common general-purpose set screw.
DIN938 Double End Stud Bolt
Metric tap-end stud bolts b1=1d, M3–M52, for flanged assemblies.