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M6 coach screw size
10 mm wrench
across-flats spanner / socket size for M6 coach
M6 coach screw — light timber fixings.
Full specification
| System | Metric coach |
| Nominal diameter | 6 mm |
| Thread pitch | coarse wood thread |
| Wrench / spanner (across flats) | 10 mm |
| Tap drill | 4 mm pilot |
| Clearance hole | 6.5 mm |
| Common grade / class | 4.6 / steel |
| Typical torque | 9 Nm (6.6 ft·lb) |
| Closest other-system size | ~1/4 in lag |
🔧 Torque unit converter
Pre-filled with the typical torque for M6 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 M6 coach
M6 coach screws fix light timber framing and metal brackets to wood.
Coach screws need a clearance hole through the bracket and a pilot in the timber.
Frequently asked questions
- What size wrench or spanner fits M6 coach?
- M6 coach screw uses a 10 mm wrench or spanner, measured across the flats of the hex head.
- What is the torque for M6 coach?
- A typical tightening torque for M6 coach screw in 4.6 / steel on dry threads is about 9 Nm (6.6 ft·lb). Always confirm against the manufacturer spec for important joints.
- What thread pitch and tap drill does M6 coach use?
- M6 coach screw has a thread pitch of coarse wood thread and uses a 4 mm pilot tap drill, with a 6.5 mm clearance hole.