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M12 flange bolt size
18 mm wrench
across-flats spanner / socket size for M12 flange
M12 flange bolt — heavy automotive joints.
Full specification
| System | Metric flange |
| Nominal diameter | 12 mm |
| Thread pitch | 1.75 mm |
| Wrench / spanner (across flats) | 18 mm |
| Tap drill | 10.2 mm |
| Clearance hole | 13.5 mm |
| Common grade / class | 10.9 |
| Typical torque | 95 Nm (70 ft·lb) |
| Closest other-system size | ~1/2 inch flange |
🔧 Torque unit converter
Pre-filled with the typical torque for M12 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 M12 flange
M12 flange bolts make heavy automotive and chassis connections.
Replace single-use flange bolts on safety-critical suspension joints.
Frequently asked questions
- What size wrench or spanner fits M12 flange?
- M12 flange bolt uses a 18 mm wrench or spanner, measured across the flats of the hex head.
- What is the torque for M12 flange?
- A typical tightening torque for M12 flange bolt in 10.9 on dry threads is about 95 Nm (70 ft·lb). Always confirm against the manufacturer spec for important joints.
- What thread pitch and tap drill does M12 flange use?
- M12 flange bolt has a thread pitch of 1.75 mm and uses a 10.2 mm tap drill, with a 13.5 mm clearance hole.