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M14 bolt size
22 mm wrench
across-flats spanner / socket size for M14
M14 bolt — heavy machinery and automotive.
Full specification
| System | Metric coarse |
| Nominal diameter | 14 mm |
| Thread pitch | 2.0 mm |
| Wrench / spanner (across flats) | 22 mm |
| Tap drill | 12.0 mm |
| Clearance hole | 15.5 mm |
| Common grade / class | 8.8 |
| Typical torque | 135 Nm (100 ft·lb) |
| Closest other-system size | ~9/16 inch |
🔧 Torque unit converter
Pre-filled with the typical torque for M14 (8.8, dry). Edit any field to convert.
⚠️ Torque values here are general references for 8.8 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 M14
M14 is used in heavier automotive and machinery joints where M12 is not enough.
M14 is less common in stores — keep spares if your equipment uses it.
Frequently asked questions
- What size wrench or spanner fits M14?
- M14 bolt uses a 22 mm wrench or spanner, measured across the flats of the hex head.
- What is the torque for M14?
- A typical tightening torque for M14 bolt in 8.8 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 M14 use?
- M14 bolt has a thread pitch of 2.0 mm and uses a 12.0 mm tap drill, with a 15.5 mm clearance hole.