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M12 socket cap screw size
10 mm hex key
Allen / internal hex key size for M12 socket cap
M12 socket cap screw — heavy tooling and machine frames.
Full specification
| System | Metric (12.9) |
| Nominal diameter | 12 mm |
| Thread pitch | 1.75 mm |
| Hex key (Allen) | 10 mm |
| Tap drill | 10.2 mm |
| Clearance hole | 13.5 mm |
| Common grade / class | 12.9 |
| Typical torque | 135 Nm (100 ft·lb) |
| Closest other-system size | ~1/2 inch |
🔧 Torque unit converter
Pre-filled with the typical torque for M12 socket cap (12.9, dry). Edit any field to convert.
⚠️ Torque values here are general references for 12.9 on clean, dry threads. Lubrication, coatings, and the joint material change the figure significantly. For structural, automotive, or safety-critical work, always use the torque specified by the manufacturer or engineer.
About M12 socket cap
M12 socket caps hold heavy tooling and machine frames together.
A 10 mm hex key and a torque tool are needed for reliable M12 clamping.
Frequently asked questions
- What size Allen / hex key fits M12 socket cap?
- M12 socket cap screw uses a 10 mm hex (Allen) key with an internal hex drive.
- What is the torque for M12 socket cap?
- A typical tightening torque for M12 socket cap screw in 12.9 on dry threads is about 135 Nm (100 ft·lb). Always confirm against the manufacturer spec for important joints.
- What thread pitch and tap drill does M12 socket cap use?
- M12 socket cap screw has a thread pitch of 1.75 mm and uses a 10.2 mm tap drill, with a 13.5 mm clearance hole.