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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 |
This page was last updated 04/24/06 10:42 AM 14845
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