ASME B18.2.3.8M Metric Hex Lag Screws
Dimensions of Metric Hex Lag Screws
| Nominal Screw Diameter, D | Body Diameter Ds, | Width Across Flats, S | Width Across Corners, E | Head Height, K | Wrenching Height, K1 | Thread Dimensions | Shoulder Diameter, Ds | Shoulder Length, Lsh | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Max | Min | Max | Min | Max | Min | Max | Min | Min | Thread Pitch, P | Flat at root, V | Depth of thread, T | Root Diameter, D1 | Max | Min | Max | Min | |
| 5 | 5.48 | 4.52 | 8.00 | 7.64 | 9.24 | 8.63 | 3.9 | 3.1 | 2.4 | 2.3 | 1.0 | 0.9 | 3.2 | 5.48 | 4.52 | 3.5 | 2.5 |
| 6 | 6.48 | 5.52 | 10.00 | 9.64 | 11.55 | 10.89 | 4.4 | 3.6 | 2.8 | 2.5 | 1.1 | 1.0 | 4.0 | 6.48 | 5.52 | 4.0 | 3.0 |
| 8 | 8.58 | 7.42 | 13.00 | 12.57 | 15.01 | 14.20 | 5.7 | 4.9 | 3.7 | 2.8 | 1.2 | 1.1 | 5.8 | 8.58 | 7.42 | 5.0 | 4.0 |
| 10 | 10.58 | 9.42 | 16.00 | 15.57 | 18.48 | 17.59 | 6.9 | 5.9 | 4.5 | 3.6 | 1.6 | 1.4 | 7.2 | 10.58 | 9.42 | 6.0 | 5.0 |
| 12 | 12.70 | 11.30 | 18.00 | 17.57 | 20.78 | 19.85 | 8.0 | 7.0 | 5.2 | 4.2 | 1.8 | 1.6 | 8.7 | 12.70 | 11.30 | 7.0 | 6.0 |
| 16 | 16.70 | 15.30 | 24.00 | 23.16 | 27.71 | 26.17 | 10.8 | 9.3 | 7.0 | 5.1 | 2.2 | 2.0 | 12.0 | 16.70 | 15.30 | 9.0 | 8.0 |
| 20 | 20.84 | 19.16 | 30.00 | 29.16 | 34.64 | 32.95 | 13.4 | 11.6 | 8.8 | 5.6 | 2.4 | 2.2 | 15.6 | 20.84 | 19.16 | 11.0 | 10.0 |
| 24 | 24.84 | 23.16 | 36.00 | 35.00 | 41.57 | 39.55 | 15.9 | 14.1 | 10.5 | 7.3 | 3.1 | 2.8 | 18.1 | 24.84 | 23.16 | 13.0 | 12.0 |
- All dimensions are in millimeters. Reduced body diameter, Dsi, is the blank diameter before rolling. Shoulder is Mandatory when body diameter is reduced.