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M10 coach screw size
17 mm wrench
across-flats spanner / socket size for M10 coach
M10 coach screw — heavy timber and joist hangers.
Full specification
| System | Metric coach |
| Nominal diameter | 10 mm |
| Thread pitch | coarse wood thread |
| Wrench / spanner (across flats) | 17 mm |
| Tap drill | 6 mm pilot |
| Clearance hole | 11 mm |
| Common grade / class | 4.6 / steel |
| Typical torque | 38 Nm (28 ft·lb) |
| Closest other-system size | ~3/8 in lag |
🔧 Torque unit converter
Pre-filled with the typical torque for M10 coach (4.6 / steel, dry). Edit any field to convert.
⚠️ Torque values here are general references for 4.6 / steel 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 M10 coach
M10 coach screws fix heavy timber, joist hangers and structural brackets.
Drive coach screws with a socket, not an impact gun, to avoid snapping the head.
Frequently asked questions
- What size wrench or spanner fits M10 coach?
- M10 coach screw uses a 17 mm wrench or spanner, measured across the flats of the hex head.
- What is the torque for M10 coach?
- A typical tightening torque for M10 coach screw in 4.6 / steel on dry threads is about 38 Nm (28 ft·lb). Always confirm against the manufacturer spec for important joints.
- What thread pitch and tap drill does M10 coach use?
- M10 coach screw has a thread pitch of coarse wood thread and uses a 6 mm pilot tap drill, with a 11 mm clearance hole.