Select the screw
Choose the nominal screw diameter used in the assembly.
Interactive dimensional reference
Select a USA socket-head cap screw diameter to retrieve the recommended counterbore, countersink, and clearance-hole dimensions. The complete reference table remains available below.
Choose the nominal screw diameter used in the assembly.
Values update instantly from the selected screw diameter.
Explore drill options for clearance holes, pilot holes, and precision machining applications.
Complete reference
All dimensions are imperial.
| Screw diameter | Counterbore diameter | Counterbore depth | Countersink diameter | Clearance diameter Normal fit |
Clearance diameter Close fit |
|---|
Make the hole
The right drill geometry keeps the hole round, on size, and on center. Solid carbide drills, ground and stocked in Michigan.