Besly Cutting Tools, Inc., 520 Blackhawk Blvd #135, South Beloit, IL 61080 (815) 389-2231   Close

Besly Drill Selector for
Taper Pipe Taps

(NPT)
Pipe Tap
Size
Threads
Per Inch
Drill Size
(with reamer)
Decimal
Equivalent
Drill Size
(without reamer)
Decimal
Equivalent
1/16 27 6.1mm .240 D .246
1/8 27 21/64 .328 Q .332
1/4 18 27/64 .422 7/16 .438
3/8 18 9/16 .562 9/16 .562
1/2 14 11/16 .688 45/64 .703
3/4 14 57/64 .891 29/32 .906
1 11-1/2 1-1/8 1.125 1-9/64 1.141
1-1/4 11-1/2 1-15/32 1.469 1-31/64 1.484
1-1/2 11-1/2 1-23/32 1.719 1-47/64 1.734
2 11-1/2 2-3/16 2.188 2-13/64 2.203
2-1/2 8 2-19/32 2.594 2-5/8 2.625

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