DIN 915 Set Screw (Dog Point) Specifications
DIN 915 Set Screws – Dog Point
ISO Equivalent: ISO 4028 | Hex Socket Dog Point Grub Screws
DIN 915 defines hex socket set screws with a cylindrical dog point — designed to engage in a drilled hole or keyway for precise, repeatable positioning. The extended pilot provides positive mechanical engagement without relying on friction alone.
Quick Specifications
Key Features
Cylindrical Dog Point
Extended pilot engages in a precisely drilled hole or slot for positive mechanical locking and exact positioning.
Precision Location
Perfect for applications requiring exact angular or axial positioning that must be repeated after disassembly.
Mechanical Engagement
Dog engages in hole or keyway — provides positive locking without relying on friction from clamping force.
Repeatable Assembly
Components return to exact same position every time — essential for timing, alignment, and phasing applications.
Dimension Chart
| Size | Pitch (Coarse) | Dog Dia. (dp) | Dog Length (z) | Hex Key Size |
|---|---|---|---|---|
| M3 | 0.5 mm | 2.0 mm | 1.5 mm | 1.5 mm |
| M4 | 0.7 mm | 2.5 mm | 2.0 mm | 2 mm |
| M5 | 0.8 mm | 3.5 mm | 2.5 mm | 2.5 mm |
| M6 | 1.0 mm | 4.0 mm | 3.0 mm | 3 mm |
| M8 | 1.25 mm | 5.5 mm | 4.0 mm | 4 mm |
| M10 | 1.5 mm | 7.0 mm | 5.0 mm | 5 mm |
| M12 | 1.75 mm | 8.5 mm | 6.0 mm | 6 mm |
| M16 | 2.0 mm | 11.0 mm | 8.0 mm | 8 mm |
| M20 | 2.5 mm | 14.0 mm | 10.0 mm | 10 mm |
| M24 | 3.0 mm | 17.0 mm | 12.0 mm | 12 mm |
Property Classes
When to Use Dog Point (DIN 915)
✓ Best Applications
- Precise positioning — dog engages in pre-drilled hole for exact location
- Timing applications — angular position must be maintained (cams, gears)
- Keyway engagement — dog extends into slot or groove in shaft
- Repeatable assembly — same position every time after disassembly
- Pivot points — dog acts as a bearing surface for rotating parts
⚠️ Consider Alternatives When
- No locating hole available → Use DIN 916 (Cup Point)
- Maximum holding power needed → Use DIN 914 (Cone Point)
- Flat surface contact required → Use DIN 913 (Flat Point)
Common Applications
DIN 915 vs ISO 4028
💡 Are They Interchangeable?
Yes — DIN 915 and ISO 4028 are dimensionally identical and fully interchangeable. Both standards define hex socket set screws with a cylindrical dog point. ISO 4028 is the international standard that supersedes DIN 915, but specifications remain the same.
Shop DIN 915 Dog Point Set Screws
Precision positioning with positive engagement. Available in alloy steel (Class 45H, 14.9) and stainless steel. Sizes M3 through M24.
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