Tap Drill Selector

Commonly used drill bits for fractional taps. Note, other drill bits can be used based upon the decimal equivalent desired. Return to the Taps & Dies page here.

Tap Size - Course	Tap Drill Size	Tap Size - Fine	Tap Drill Size
1/4-20	13/64	1/4-28	Number 3
5/16-18	Letter F	5/16-24	Letter H
3/8-16	5/16	3/8-24	21/64
7/16-14	23/64	7/16-20	25/64
1/2-13	27/64	1/2-20	29/64
9/16-12	15/32	9/16-18	1/2
5/8-11	17/32	5/8-18	9/16
3/4-10	41/64	3/4-16	11/16
7/8-9	49/64	7/8-14	51/64
1"-8	55/64	1"-14	59/64
1-1/8"-7	31/32	1-1/8"-12	1-1/32
1-1/4"-7	1-3/32	1-1/4"-12	1-11/64
1-3/8"-6	1-13/64	1-3/8"12	1-19/64
1-1/2"-6	1-21/64	1-1/2"-12	1-27/64

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