Morris Dovey’s Tap and Drill Table

 
Number Sizes Fractional Sizes
Screw Size Threads/Inch Drill Sizes Screw Size Threads/Inch Drill Sizes
Nr OD NC NF Tap Clear Nr OD NC NF Tap Clear
0 0.060 -- 80 3/64 #51 1/4 0.250 20 -- #7 17/64
1 0.073 64 -- #53 #47 1/4 0.250 -- 28 #3 17/64
1 0.073 -- 72 #53 #47 5/16 0.312 18 -- F 21/64
2 0.086 56 -- #50 #42 5/16 0.312 -- 24 I 21/64
2 0.086 -- 64 #50 #42 3/8 0.375 16 -- 5/16 25/64
3 0.099 48 -- #47 #37 3/8 0.375 -- 24 Q 25/64
3 0.099 -- 56 #46 #37 7/16 0.437 14 -- U 29/64
4 0.112 40 -- #43 #31 7/16 0.437 -- 20 25/64 29/64
4 0.112 -- 48 3/32 #31 1/2 0.500 13 -- 27/64 33/64
5 0.125 40 -- #38 #29 1/2 0.500 -- 20 29/64 33/64
5 0.125 -- 44 #37 #29 9/16 0.562 12 -- 31/64 37/64
6 0.138 32 -- #36 #27 9/16 0.562 -- 18 33/64 37/64
6 0.138 -- 40 #33 #27 5/8 0.625 11 -- 17/32 41/64
8 0.164 32 -- #29 #18 5/8 0.625 -- 18 37/64 41/64
8 0.164 -- 36 #29 #18 3/4 0.750 10 -- 21/32 49/64
10 0.190 24 -- #26 #9 3/4 0.750 -- 16 11/16 49/64
10 0.190 -- 32 #21 #9 7/8 0.875 9 -- 49/64 57/64
12 0.216 24 -- #16 #2 7/8 0.875 -- 14 13/16 57/64
12 0.216 -- 28 #15 #2 1 1.000 8 -- 7/8 1 1/4
1 1.000 -- 14 15/16 1 1/4
Note: Tap/drill Sizes shown provide approximately 75% depth of thread.

Copyright © 2003 Morris R Dovey

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