Common Screw Drill Sizes Used in Building Robots - dummies

Common Screw Drill Sizes Used in Building Robots

By Roger Arrick, Nancy Stevenson

Part of Robot Building For Dummies Cheat Sheet

The following table shows the tap drill and clearance drill bit sizes to use with various screw sizes that are commonly used in robot building. Keeping this information handy can save you some while you build.

Screw Tap Drill Clearance Drill
2-256 .070 (#50) .089 (#43)
4-40 .089 (#43) .116 (#32)
6-32 .106 (#36) .144 (#27)
8-32 .136 (#29) .170 (#18)
10-32 .159 (#21) .196 (#9)