List of drill and tap sizes

A list of drill and tap sizes typically includes various standard sizes for drill bits and corresponding tap sizes for creating threaded holes. Here’s a general outline of common drill and tap sizes used in the manufacturing and machining industries, primarily in North America, following the Unified National Thread Standards (UN). ### Common Drill Sizes for Taps 1. **Tap Size - Drill Bit Size** - 0-80 - 0.228" - 1-64 - 0.