Pilot Hole Sizes
| Nominal Diameter of Lag Bolt, inches | Shank (Unthreaded) Portion, inches | Diameter of Pilot Hole, inches (Thread Portion) |
|---|---|---|
| 3⁄8 | 3⁄8 | 15⁄64 |
| 7⁄16 | 7⁄16 | 9⁄32 |
| 1⁄2 | 1⁄2 | 5⁄16 |
| 9⁄16 | 9⁄16 | 23⁄64 |
| 5⁄8 | 5⁄8 | 13⁄32 |
| 3⁄4 | 3⁄4 | 1⁄2 |
| 7⁄8 | 7⁄8 | 39⁄64 |
| 1 | 1 | 23⁄32 |
| 11⁄8 | 11⁄8 | 53⁄64 |
| 11⁄4 | 11⁄4 | 15⁄16 |
| Table provided by OBEC Consulting Engineers | ||