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M12 lag / coach screw size
19 mm wrench
wrench size for M12 coach screw
M12 coach screw — Heavy timber, structural wood, beams.
Full specification
| System | Metric coarse |
| Nominal diameter | 12 mm |
| Thread pitch | 1.75 mm |
| Wrench size | 19 mm |
| Pilot drill (wood) | 9.0 mm |
| Clearance hole | 13.5 mm |
| Common grade / class | 4.6 |
| Typical torque | 60 Nm (44.3 ft·lb) |
About M12 coach screws
Heavy timber, structural wood, beams.
Coach screws (also called lag screws) have a hexagonal head and wood screw thread. They are designed for heavy-duty applications in wood, including timber framing, decking, and structural wood connections.
Always drill a pilot hole to prevent splitting. The pilot hole should be slightly smaller than the core diameter of the screw.
Frequently asked questions
- What size wrench fits M12 coach screw?
- M12 coach screw uses a 19 mm wrench.
- What is the torque for M12 coach screw?
- Typical torque for M12 coach screw is about 60 Nm (44.3 ft·lb).
- What are coach screws used for?
- M12 coach screws are used in heavy timber, structural wood, beams.