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M3 socket cap screw size
2.5 mm Allen key
hex key size for M3 socket cap screw
M3 socket cap screw — Precision machinery, aerospace, robotics.
Full specification
| System | Metric coarse |
| Nominal diameter | 3 mm |
| Thread pitch | 0.5 mm |
| Allen key / hex socket | 2.5 mm |
| Tap drill | 2.5 mm |
| Clearance hole | 3.4 mm |
| Common grade / class | 12.9 |
| Typical torque | 1.6 Nm (1.18 ft·lb) |
🔧 Torque unit converter
Pre-filled with the typical torque for M3 (12.9, dry).
About M3 socket cap screws
Precision machinery, aerospace, robotics.
Socket cap screws (also called Allen head cap screws) have a cylindrical head with a hexagonal socket. They provide a clean appearance and can be used in tight spaces where a wrench cannot fit.
Grade 12.9 indicates high-strength alloy steel, quenched and tempered. These are commonly used in precision machinery, CNC equipment, and aerospace applications.
Frequently asked questions
- What size Allen key fits M3 socket cap screw?
- M3 socket cap screw uses a 2.5 mm Allen key (hex key).
- What is the torque for M3 socket cap screw?
- A typical tightening torque for M3 socket cap screw in 12.9 is about 1.6 Nm (1.18 ft·lb).
- What are socket cap screws used for?
- M3 socket cap screws are used in precision machinery, aerospace, robotics.