Clearance hole answer
3/8 bolt Clearance Hole Size
For 3/8 bolt, a common close-fit clearance is 13/32 in and a looser free-fit clearance is 7/16 in.
3/8 bolt clearance hole quick answer
| Fastener | Nominal diameter | Close fit | Free fit | Use note |
|---|---|---|---|---|
| 3/8 bolt | 0.375 in | 13/32 in | 7/16 in | Choose fit based on alignment and coating thickness. |
Close fit or free fit?
Close fit helps location and alignment. Free fit is easier when parts are painted, plated, cut by hand, or assembled in the field. Use the drawing if it specifies a fit class.
Related references
Clearance Hole ChartCompare close-fit and free-fit clearance holes for common screws and bolts.Pilot Hole vs Clearance HoleThe difference between pilot holes, tap drill holes, and clearance holes with practical examples.Drill Size ChartFind fractional, number, letter, and metric drill sizes with decimal inch and millimeter equivalents.