Drill Size for Pipe Taps

Pipe Size Use Drill Bit Alternate Bit Size
1/8" X 27 NPT  11/32
1/4" X 18 NPT   7/16
3/8" X 18 NPT  37/64 9/16
1/2" X 14 NPT  23/32 3/4
3/4" X 14 NPT  59/64 15/16
1" X 11-1/2 NPT 1-5/32
1-1/4" X 11-1/2 NPT 1-1/2
1-1/2" X 11-1/2 NPT 1-47/64 1-3/4
2" x 11-1/2 NPT 2-7/32
 

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Last update: March 18, 2008 05:16 PM
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