Home>Technical Resources for Fasteners>Recommended Tapping Drill Sizes and Clearance Holes
Steel Bolt Nut Threaded Fastener Hardness Force Metric Conversion Table Standards UNC

Recommended Tapping Drill and Clearance Hole Sizes

Optimas are a full-service supply chain and manufacturing solutions provider.   Before you design your next product or make updates to an existing product, consider partnering with Optimas to take advantage of our many capabilities.

Use these tables for calculating the relevant size drill bit and clearance hole for ISO metric coarse and fine threads.

All dimensions are in millimeters (mm).

Let Us Help You Find Efficiencies