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M14 flange bolt size
21 mm wrench
across-flats spanner / socket size for M14 flange
M14 flange bolt — heavy chassis and driveline.
Full specification
| System | Metric flange |
| Nominal diameter | 14 mm |
| Thread pitch | 2.0 mm |
| Wrench / spanner (across flats) | 21 mm |
| Tap drill | 12.0 mm |
| Clearance hole | 15.5 mm |
| Common grade / class | 10.9 |
| Typical torque | 150 Nm (111 ft·lb) |
| Closest other-system size | ~9/16 inch flange |
🔧 Torque unit converter
Pre-filled with the typical torque for M14 flange (10.9, dry). Edit any field to convert.
⚠️ Torque values here are general references for 10.9 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 M14 flange
M14 flange bolts are used in heavy chassis and driveline connections.
Follow the maker torque sequence on multi-bolt flanges to seat them evenly.
Frequently asked questions
- What size wrench or spanner fits M14 flange?
- M14 flange bolt uses a 21 mm wrench or spanner, measured across the flats of the hex head.
- What is the torque for M14 flange?
- A typical tightening torque for M14 flange bolt in 10.9 on dry threads is about 150 Nm (111 ft·lb). Always confirm against the manufacturer spec for important joints.
- What thread pitch and tap drill does M14 flange use?
- M14 flange bolt has a thread pitch of 2.0 mm and uses a 12.0 mm tap drill, with a 15.5 mm clearance hole.