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Cutting Fluids
 

Tap Drill Chart for Pipe Taps

This tap drill chart is for Pipe taps. NPT

 

Drill size recommendations are for 70-75% thread height.

Drills produce a hole slightly larger then their normal size.

Size obtained will depend on drill style, condition etc.

 


Pipe Tap & Pitch Drill Size Decimal
1/16-27 C .2420
1/8-27 Q. .3320
1/4-18 7/16 .4375
3/8-18 9/16 .5625
1/2-14 45/64 .7031
3/4-14 29/32 .9062
1-11-1/2 1-9/64 1.1406
1-1/4-11-1/2 1-31/64 1.4844
1-1/2-11-1/2 1-23/32 1.7188
2-11-1/2 2-3/16 2.1875

 

Standard Metric Number Pipe


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