Select the screw
Choose the nominal screw diameter used in the assembly.
Interactive dimensional reference
Select a metric 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.
Complete reference
All dimensions are metric.
| Screw diameter | Counterbore diameter | Counterbore depth | Countersink diameter | Clearance diameter Normal fit |
Clearance diameter Close fit |
|---|
From reference to the right tool
A clearance hole, a flat-bottom recess, and a conical chamfer are different features. Use the dimensions above to compare the tools needed for your drawing.
A countersink does not produce the flat-bottom recess shown in the counterbore diagram. Confirm all dimensions and tolerances against the fastener specification and your drawing.
Order your tools online. Use the dimensions above to compare cutter diameter, cutting length, material suitability, and product specifications before adding tools to your cart.
Shop flat-bottom end mills →Browse related tools, then check the product specifications against your material, dimensions, and setup.