Thelen Tree Farm

Celebrating 17 Years - 2001 ~ 2018  



Tapping Information

This page contains information regarding tap and clearance drills for American Standard machine screws from 0 to 1 3/4 (0.060 to 1.750 inches)

Machine Screw
Size
Thds
Per Inch
Minor
Dia
Tap Drills Clearance Hole Drills
Alum, Brass,
& Plasitcs

75% Thread

Stainless Steel,
Steels & Iron

50% Thread

All Materials
Close Fit Free Fit
# or Dia Major
Dia
Drill
Size
Dec.
Equiv.
Drill
Size
Decimal
Equiv.
Drill
Size
Dec.
Equiv.
Drill
Size
Dec.
Equiv.
0 .060 80 .045 3/64 .047 55 .0520 52 .063 50 .070
1 .073 64 .054 53 .059 1/16 .0625 48 .076 46 .081
72 .056 53 .059 52 .0635
2 .086 56 .064 50 .070 49 .0730 43 .089 41 .096
64 .067 50 .070 48 .0760
3 .099 48 .073 47 .078 44 .0860 37 .104 35 .110
56 .077 45 .082 43 .0890
4 .112 40 .081 43 .089 41 .0960 32 .116 30 .128
48 .086 42 .093 40 .0980
5 .125 40 .094 38 .101 7/64 .1094 30 .128 29 .136
44 .097 37 .104 35 .1100
6 .138 32 .100 36 .106 32 .1160 27 .144 25 .149
40 .107 33 .113 31 .1200
8 .164 32 .126 29 .136 27 .1440 18 .169 16 .177
36 .1300 29 .136 26 .1470
10 .190 24 .139 25 .149 20 .1610 9 .196 7 .201
32 .152 21 .159 18 .1695
12 .216 24 .165 16 .177 12 .1890 2 .221 1 .228
28 .172 14 .182 10 .1935
32 .178 13 .185 9 .1960
1/4 .250 20 .189 7 .201 7/32 .2188 F .257 H .266
28 .206 3 .213 1 .2280
32 .212 7/32 .219 1 .2280
5/16 .312 18 .244 F .257 J .2770 P .323 Q .332
24 .261 I .272 9/32 .2812
32 .274 9/32 .281 L .2900
3/8 .375 16 .298 5/16 .312 Q .3320 W .386 X .397
24 .324 Q .332 S .3480
32 .337 11/32 .344 T .3580
7/16 .437 14 .3500 U .368 25/64 .3906 29/64 .453 15/32 .469
20 .376 25/64 .391 13/32 .4062
28 .394 Y .404 Z .4130
1/2 .500 13 .406 27/64 .422 29/64 .4531 33/64 .516 17/32 .531
20 .439 29/64 .453 15/32 .4688
28 .456 15/32 .469 15/32 .4688
9/16 .562 12 .460 31/64 .484 33/64 .5156 37/64 .578 19/32 .594
18 .494 33/64 .516 17/32 .5312
24 .511 33/64 .516 17/32 .5312
5/8 .625 11 .513 17/32 .531 9/16 .5625 41/64 .641 21/32 .656
18 .557 37/64 .578 19/32 .5938
24 .574 37/64 .578 19/32 .5938
11/16 .687 24 .636 41/64 .641 21/32 .6562 45/64 .703 23/32 .656
3/4 .750 10 .627 21/32 .656 11/16 .6875 49/64 .766 25/32 .781
16 .673 11/16 .687 45/64 .7031
20 .689 45/64 .703 23/32 .7188
13/16 .812 20 .751 49/64 .766 25/32 .7812 53/64 .828 27/32 .844
7/8 .875 9 .739 49/64 .766 51/64 .7969 57/64 .891 29/32 .906
14 .787 13/16 .812 53/64 .8281
20 .814 53/64 .828 27/32 .8438
15/16 .937 20 .876 57/64 .891 29/32 .9062 61/64 .953 31/32 .969
1 1.000 8 .847 7/8 .875 59/64 .9219 1-1/64 1.016 1-1/32 1.031
12 .898 15/16 .937 61/64 .9531
20 .939 61/64 .953 31/32 .9688
1-1/16 1.062 18 .994 1.000 1.000 1-1/64 1.0156 1-5/64 1.078 1-3/32 1.0938
1-1/8 1.125 7 .950 63/64 .984 1-1/32 1.0313 1-9/64 1.141 1-5/32 1.156
12 1.023 1-3/64 1.047 1-5/64 1.0781
18 1.057 1-1/16 1.062 1-5/64 1.0781
1-3/16 1.187 18 1.119 1-1/8 1.125 1-9/64 1.1406 1-13/64 1.203 1-7/32 1.219

1-1/4

1.250

7 1.075 1-7/64 1.109 1-5/32 1.1562

1-17/64

1.266

1-9/32

1.281

12 1.148 1-11/64 1.172 1-13/64 1.2031
18 1.182 1-3/16 1.187 1-13/64 1.2031
1-5/16 1.312 18 1.244 1-1/4 1.250 1-17/64 1.2656 1-21/64 1.328 1-11/32 1.344
1-3/8 1.375 6 1.170 1-7/32 1.219 1-17/64 1.2656 1-25/64 1.391 1-13/32 1.406
12 1.273 1-19/64 1.297 1-21/64 1.3281
18 1.307 1-5/16 1.312 1-21/64 1.3281
1-7/16 1.437 18 1.369 1-3/8 1.375 1-25/64 1.3906 1-29/64 1.453 1-15/32 1.469
1-1/2 1.500 6 1.295 1-11/32 1.344 1-25/64 1.3906 1-33/64 1.516 1-17/32 1.531
12 1.398 1-27/64 1.422 1-7/16 1.4375
18 1.432 1-7/16 1.437 1-29/64 1.4531
1-9/16 1.562 18 1.494 1-12 1.500 1-33/64 1.5156 1-37/64 1.578 1-19/32 1.594
1-5/8 1.625 18 1.557 1-9/16 1.562 1-37/64 1.5781 1-41/64 1.641 1-21/32 1.656
1-11/16 1.687 18 1.619 1-5/8 1.625 1-41/64 1.6406 1-45/64 1.703 1-23/32 1.719
1-3/4 1.750 5 1.505 1-9/16 1.562 1-5/8 1.6250 1-49/64 1.766 1-25/32 1.781
# or Dia Major
Dia

Thds
Per
Inch

Minor
Dia
Drill
Size
Dec.
Equiv.
Drill
Size
Decimal
Equiv.
Drill
Size
Dec.
Equiv.
Drill
Size
Dec.
Equiv.
Machine Screw
Size
Alum, Brass,
& Plasitcs

75% Thread

Stainless Steel,
Steels & Iron

50% Thread

Close Fit Free Fit
All Materials
Tap Drills Clearance Hole Drills