Thread prep
1/2-13 Tap Drill
Tap drill and clearance reference for 1/2-13.
75% thread engagementUNC standard
Tap drill27/64
Decimal0.4219 in / 10.72 mm
| Fit type | Clearance hole |
|---|---|
| Close fit | 0.515 in |
| Normal fit | 0.531 in |
| Loose fit | 0.5625 in |

Thread prep
Tap drill and clearance reference for 1/2-13.
| Fit type | Clearance hole |
|---|---|
| Close fit | 0.515 in |
| Normal fit | 0.531 in |
| Loose fit | 0.5625 in |