Set / Grub Screws — Complete Size Reference
Complete reference for metric set screws (grub screws) from M3 to M10. Allen key sizes, torque specifications, and applications.
M31.5 mm Allen key · 0.9 NmM42 mm Allen key · 2.5 NmM52.5 mm Allen key · 4.5 NmM63 mm Allen key · 8 NmM84 mm Allen key · 18 NmM105 mm Allen key · 35 Nm
About set screws
Set screws (also called grub screws) are headless screws with a hexagonal socket. They are used to secure an object within or against another object.
Common applications
- Securing pulleys to shafts
- Fixing gears on shafts
- Shaft collars
- Adjustable fixtures
Types of set screw points
- Cup point: Most common, good holding power
- Flat point: For frequent adjustments
- Dog point: For permanent location
- Cone point: For precise positioning