M4 Allen Grub Screw
DIN 916 M4 hexagon socket set screws with cup point in hardened alloy steel. Headless design installs fully within a threaded bore for compact shaft-locking at 4mm diameter.
Specification
#
Standard
DIN 916 / ISO 4029 (EN ISO 4029)
Material
Alloy Steel
Thread
Coarse (standard)
Grade
12.9
Coating
Black oxide
Head Type
Headless (no head)
Drive Type
Hexagon socket (Allen key/hex wrench)
Point Type
Cup point (concave depression)
Dimension
#
Size
Thread Dia (d)
Pitch
Length(L)
Thread Length (b)
M3
2.87-3.00
0.5
3mm - 20mm
Full
M4
3.85-4.00
0.7
4mm - 30mm
Full
M5
4.85-5.00
0.8
4mm - 40mm
Full
M6
5.85-6.00
1.0
5mm - 50mm
Full
M8
7.83-8.00
1.25
6mm - 50mm
Full
- All dimensions in mm, tolerance +/- 0.01 mm. Additional dimensions available on request.
Benefits
#
The 4mm grub screw addresses shaft-locking requirements where a headless, fully recessed fastener is needed. Cup point geometry concentrates force on a small contact area, producing reliable indentation-based locking without keyed connections. Internal hex drive allows installation with standard Allen keys in confined spaces. Hardened alloy steel maintains cup point effectiveness across repeated installations. This diameter is commonly used for pulley fixation, bearing locknut securing, and handle attachment in mechanical assemblies.
Common Applications
#
M4 grub screws are specified for shaft-locking and component fixation:
- Shaft-to-collar and shaft-to-gear locking
- Pulley and sprocket fixation
- Door handle and lockset assemblies
- Bicycle component clamping
- Cam and lever fixation
Read Me
| Standard | DIN 916 / ISO 4029 (EN ISO 4029) |
| Material | Alloy Steel |
| Thread | Coarse (standard) |
| Grade | 12.9 |
| Coating | Black oxide |
| Head Type | Headless (no head) |
| Drive Type | Hexagon socket (Allen key/hex wrench) |
| Point Type | Cup point (concave depression) |
| Size | Thread Dia (d) | Pitch | Length(L) | Thread Length (b) |
|---|---|---|---|---|
| M3 | 2.87-3.00 | 0.5 | 3mm - 20mm | Full |
| M4 | 3.85-4.00 | 0.7 | 4mm - 30mm | Full |
| M5 | 4.85-5.00 | 0.8 | 4mm - 40mm | Full |
| M6 | 5.85-6.00 | 1.0 | 5mm - 50mm | Full |
| M8 | 7.83-8.00 | 1.25 | 6mm - 50mm | Full |
