Socket Cap Screws — Complete Size Reference
Complete reference for metric socket cap screws (Allen head) from M3 to M20. Allen key sizes, torque specifications, and applications.
M32.5 mm Allen key · 1.6 NmM43 mm Allen key · 3.5 NmM54 mm Allen key · 7 NmM65 mm Allen key · 12 NmM86 mm Allen key · 25 NmM108 mm Allen key · 50 NmM1210 mm Allen key · 85 NmM1614 mm Allen key · 180 NmM2017 mm Allen key · 350 Nm
About socket cap screws
Socket cap screws (also called Allen head cap screws or button head screws) have a cylindrical head with a hexagonal socket. They are tightened with an Allen key (hex key).
Advantages of socket cap screws
- Clean, low-profile appearance
- Can be used in tight spaces
- High strength (typically grade 12.9)
- Common in precision machinery and aerospace
Common applications
Socket cap screws are widely used in:
- CNC machines and precision equipment
- 3D printers and robotics
- Aerospace applications
- Automotive performance parts
- Molds and dies