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🔗 Lag & Coach Screws
Heavy hex-head screws for timber. Wrench size, recommended pilot hole and approximate seating torque (varies with wood density).
| Size | Wrench | Pitch | Torque |
|---|---|---|---|
| 1/4-inch lag screw | 7/16 in | coarse wood thread | 13 Nm (9.6 ft·lb) |
| 5/16-inch lag screw | 1/2 in | coarse wood thread | 27 Nm (19.9 ft·lb) |
| 3/8-inch lag screw | 9/16 in | coarse wood thread | 47 Nm (35 ft·lb) |
| 1/2-inch lag screw | 3/4 in | coarse wood thread | 95 Nm (70 ft·lb) |
| 5/8-inch lag screw | 15/16 in | coarse wood thread | 160 Nm (118 ft·lb) |
| M6 coach screw | 10 mm | coarse wood thread | 9 Nm (6.6 ft·lb) |
| M8 coach screw | 13 mm | coarse wood thread | 20 Nm (14.8 ft·lb) |
| M10 coach screw | 17 mm | coarse wood thread | 38 Nm (28 ft·lb) |
| M12 coach screw | 19 mm | coarse wood thread | 62 Nm (46 ft·lb) |
All lag & coach screws
1/4 in lag7/16 in · coarse wood thread5/16 in lag1/2 in · coarse wood thread3/8 in lag9/16 in · coarse wood thread1/2 in lag3/4 in · coarse wood thread5/8 in lag15/16 in · coarse wood threadM6 coach10 mm · coarse wood threadM8 coach13 mm · coarse wood threadM10 coach17 mm · coarse wood threadM12 coach19 mm · coarse wood thread