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M16 socket cap screw size
14 mm hex key
Allen / internal hex key size for M16 socket cap
M16 socket cap screw — very heavy tooling and dies.
Full specification
| System | Metric (12.9) |
| Nominal diameter | 16 mm |
| Thread pitch | 2.0 mm |
| Hex key (Allen) | 14 mm |
| Tap drill | 14.0 mm |
| Clearance hole | 17.5 mm |
| Common grade / class | 12.9 |
| Typical torque | 330 Nm (243 ft·lb) |
| Closest other-system size | ~5/8 inch |
🔧 Torque unit converter
Pre-filled with the typical torque for M16 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 M16 socket cap
M16 socket caps are used in heavy dies and large tooling plates.
A 14 mm hex key is large — a socket-style hex bit on a wrench gives better leverage.
Frequently asked questions
- What size Allen / hex key fits M16 socket cap?
- M16 socket cap screw uses a 14 mm hex (Allen) key with an internal hex drive.
- What is the torque for M16 socket cap?
- A typical tightening torque for M16 socket cap screw in 12.9 on dry threads is about 330 Nm (243 ft·lb). Always confirm against the manufacturer spec for important joints.
- What thread pitch and tap drill does M16 socket cap use?
- M16 socket cap screw has a thread pitch of 2.0 mm and uses a 14.0 mm tap drill, with a 17.5 mm clearance hole.