Thread prep
1/4-28 Tap Drill
Tap drill and clearance reference for 1/4-28.
75% thread engagementUNF standard
Tap drill#3
Decimal0.213 in / 5.41 mm
| Fit type | Clearance hole |
|---|---|
| Close fit | 0.257 in |
| Normal fit | 0.266 in |
| Loose fit | 0.281 in |
Thread prep
Tap drill and clearance reference for 1/4-28.
| Fit type | Clearance hole |
|---|---|
| Close fit | 0.257 in |
| Normal fit | 0.266 in |
| Loose fit | 0.281 in |