Refer to Machinery's Handbook 3rd Edition page 1422.
| Lag Screw Size | Width Across Flats (in) | Body OD (in) | Screw TPI | Soft Wood |
| Straight Bit | ||||
| #10 | 9/32 | 0.199 | 11 | |
| 1/4 | 3/8 | 0.260 | 10 | 3/32" |
| 5/16 | 1/2 | 0.324 | 9 | 9/64" |
| 3/8 | 9/16 | 0.388 | 7 | 11/64" |
| 7/16 | 5/8 | 0.452 | 7 | 7/32” |
| 1/2 | 3/4 | 0.515 | 6 | 1/4" |
| 5/8 | 15/16 | 0.642 | 5 | 5/16" |
| 3/4 | 1 1/8 | 0.768 | 4.5 | 3/8" |
| 7/8 | 1 5/16 | 0.895 | 4 | 7/16" |
| 1 | 1 1/2 | 1.022 | 3.5 | 1/2” |
| 1 1/8 | 1 11/16 | 1.149 | 3.25 | 9/16" |
| 1 1/4 | 1 7/8 | 1.277 | 3.25 | 5/8" |