Tap Fractional Drill Bit Number Drill Bit Letter Drill Bit 0-80 3/64 - - 1-64 - 53 - 2-56 - 50 - 3-48 - 47 - 4-40 3/32 43 - 5-40 - 38 - 6-32 7/64 35 - 8-32 - 29 - 10-24 5/32 25 - 10-32 5/32 21 - 12-24 11/64 16 - 1/4-20 13/64 7 - 1/4-28 7/32 3 - 5/16-18 17/64 - F 5/16-24 - - I 3/8-16 5/16 - - 3/8-24 21/64 - Q 7/16-14 23/64 - U 7/16-20 25/64 - - 1/2-13 27/64 - - 1/2-20 29/64 - - 9/16-12 31/64 - - 9/16-18 33/64 - - 5/8-11 17/32 - - 5/8-18 37/64 - - 3/4-10 21/32 - - 3/4-16 11/16 - - Drill sizes are for 75% depth of thread.
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