Tap Drills


Tap & Thread Information Tap Drills Clearance Drills
Size Major
Dia.		 Threads
Per
Inch		 Thread Minor Diameter Aluminum, Brass
& Plastics
75% Thread		 Stainless Steel,
Steels & Iron
50% Thread		 Close Fit Loose Fit
DrillDia. DrillDia. DrillDia. DrillDia.
0 .060 80 .045 3/64 .047 55 .052 52 .064 50 .070
1 .073 64 .054 53 .060 1/16 .063 48 .076 46 .081
72 .056 53 .060 52 .064
2 .086 56 .064 50 .070 49 .073 43 .089 41 .096
64 .067 50 .070 48 .076
3 .099 48 .073 47 .079 44 .086 37 .104 35 .110
56 .077 45 .082 43 .089
4 .112 40 .081 43 .089 41 .096 32 .116 30 .129
48 .086 42 .094 40 .098
5 .125 40 .094 38 .102 7/64 .109 30 .129 29 .136
44 .097 37 .104 35 .110
6 .138 32 .100 36 .107 32 .116 27 .144 25 .150
40 .107 33 .113 31 .120
8 .164 32 .126 29 .136 27 .144 18 .170 16 .177
36 .130 29 .136 26 .147
10 .190 24 .139 25 .150 20 .161 9 .196 7 .201
32 .152 21 .159 18 .170
12 .216 24 .165 16 .177 12 .189 2 .221 1 .228
28 .172 14 .182 10 .194
32 .178 13 .185 9 .196
1/4 .250 20 .189 7 .201 7/32 .219 F .257 H .266
28 .206 3 .213 1 .228
32 .212 7/32 .219 1 .228
5/16 .313 18 .244 F .257 J .277 P .323 Q .332
24 .261 I .272 9/32 .281
32 .274 9/32 .281 L .290
3/8 .375 16 .298 5/16 .313 Q .332 W .386 X .397
24 .324 Q .332 S .348
32 .337 11/32 .344 T .358
7/16 .438 14 .350 U .368 25/64 .391 29/64 .453 15/32 .469
20 .376 25/64 .391 13/32 .406
28 .394 Y .404 Z .413
1/2 .500 13 .406 27/64 .422 29/64 .453 33/64 .516 17/32 .531
20 .439 29/64 .453 15/32 .469
28 .456 15/32 .469 15/32 .469
9/16 .563 12 .460 31/64 .484 33/64 .516 37/64 .578 19/32 .594
18 .494 33/64 .516 17/32 .531
24 .511 33/64 .516 17/32 .531
5/8 .625 11 .513 17/32 .531 9/16 .562 41/64 .641 21/32 .656
18 .556 37/64 .578 19/32 .594
24 .574 37/64 .578 19/32 .594
11/16 .688 24 .636 41/64 .641 21/32 .656 45/64 .703 23/32 .656
3/4 .750 10 .627 21/32 .656 11/16 .688 49/64 .766 25/32 .781
16 .673 11/16 .688 45/64 .703
20 .689 45/64 .703 23/32 .719
13/16 .813 20 .751 49/64 .766 25/32 .781 53/64 .828 27/32 .844
7/8 .875 9 .739 49/64 .766 51/64 .797 57/64 .891 29/32 .906
14 .787 13/16 .813 53/64 .828
20 .814 53/64 .828 27/32 .844
15/16 .938 20 .876 57/64 .891 29/32 .906 61/64 .953 31/32 .969
1 1.000 8 .847 7/8 .875 59/64 .922 1-1/64 1.0156 1-1/32 1.0313
12 .898 15/16 .938 61/64 .953
20 .939 61/64 .953 31/32 .969