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M6 socket cap screw size
5 mm hex key
Allen / internal hex key size for M6 socket cap
M6 socket cap screw — machinery and tooling.
Full specification
| System | Metric (12.9) |
| Nominal diameter | 6 mm |
| Thread pitch | 1.0 mm |
| Hex key (Allen) | 5 mm |
| Tap drill | 5.0 mm |
| Clearance hole | 6.6 mm |
| Common grade / class | 12.9 |
| Typical torque | 16 Nm (11.8 ft·lb) |
| Closest other-system size | ~1/4 inch |
🔧 Torque unit converter
Pre-filled with the typical torque for M6 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 M6 socket cap
M6 socket caps are a staple of machine tooling and fixtures.
A 5 mm hex key fits M6 cap screws — a very common workshop size.
Frequently asked questions
- What size Allen / hex key fits M6 socket cap?
- M6 socket cap screw uses a 5 mm hex (Allen) key with an internal hex drive.
- What is the torque for M6 socket cap?
- A typical tightening torque for M6 socket cap screw in 12.9 on dry threads is about 16 Nm (11.8 ft·lb). Always confirm against the manufacturer spec for important joints.
- What thread pitch and tap drill does M6 socket cap use?
- M6 socket cap screw has a thread pitch of 1.0 mm and uses a 5.0 mm tap drill, with a 6.6 mm clearance hole.