Quick Reference: Drill and Tap Size Tables

Keep these tables handy for matching drill bits to tap sizes.

For UNC threads, use the standard drill chart: #1-64 uses #53 drill, #2-56 uses #50, etc.

For metric coarse threads, common sizes: M6x1.0 uses 5mm drill, M8x1.25 uses 6.8mm drill.

Pipe taps require specific drill sizes: 1/8-27 NPT uses 21/64" drill, 1/4-18 NPT uses 7/16".

Always check thread depth: for blind holes, drill deeper than required tap depth.

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