Call 817-226-6444
Non-Standard Fasteners Made to Unique Specifications
Fast-Spec, Inc. 475 Dodson Lake Drive
Arlington, Texas 76012
Tap Drill Chart
Tap Drill Chart - Standard 2B
| Tap Size |
Cut Tap Drill |
Roll Tap Drill |
Minor θ |
Major θ |
| 0-80 |
3/64 |
.0469 |
1.35mm |
.0531 |
.0465/.0514 |
.060 |
| 1-72 |
#53 |
.0595 |
1.7mm |
.0669 |
.0580/.0635 |
.060 |
| 1-64 |
#53 |
.0595 |
1.65mm |
.0650 |
.0561/.0623 |
.073 |
| 2-64 |
#50 |
.070 |
2.0mm |
.0787 |
.0691/.0753 |
.086 |
| 2-56 |
#50 |
.070 |
5/64 |
.0781 |
.0667/.0737 |
.086 |
| 3-48 |
#47 |
.0785 |
#43 |
.089 |
.0764/.0845 |
.099 |
| 3-56 |
#45 |
.0820 |
2.3mm |
.0906 |
.0797/.0865 |
.099 |
| 4-40 |
#43 |
.0890 |
#39 |
.0995 |
.0849/.0939 |
.112 |
| 4-48 |
#42 |
.0935 |
2.6mm |
.1024 |
.0894/.0968 |
.112 |
| 5-40 |
#38 |
.1015 |
#33 |
.1130 |
.0979/.1062 |
.125 |
| 5-44 |
#37 |
.1040 |
2.9mm |
.1142 |
.1004/.1079 |
.125 |
| 6-32 |
#36 |
.1065 |
3.1mm |
.1220 |
.104/.114 |
.138 |
| 6-40 |
#33 |
.1130 |
3.2mm |
.1260 |
.111/.119 |
.138 |
| 8-36 |
#29 |
.1360 |
#25 |
.1495 |
.130/.139 |
.164 |
| 10-24 |
#25 |
.1495 |
11/64 |
.1719 |
.145/.156 |
.190 |
| 10-32 |
#21 |
.1590 |
#16 |
.1770 |
.156/.164 |
.190 |
| 12-24 |
#16 |
.1770 |
5.0mm |
.1968 |
.171/.181 |
.216 |
| 12-28 |
#14 |
.1820 |
#8 |
.1990 |
.177/.186 |
.216 |
| 12-32 |
3/16 |
.1875 |
* |
* |
.182/.190 |
.216 |
| 1/4-20 |
#7 |
.2010 |
#1 |
.2280 |
.196/.207 |
.250 |
| 1/4-28 |
#3 |
.2130 |
A |
.2340 |
.211/.220 |
.250 |
| 1/4-32 |
7/32 |
.2188 |
* |
* |
.216/.224 |
.250 |
| 5/16-18 |
F |
.2570 |
L |
.2880 |
.252/.265 |
.312 |
| 5/16-24 |
I |
.2720 |
M |
.2950 |
.267/.277 |
.312 |
| 5/16-32 |
9/32 |
.2813 |
* |
* |
.279/.286 |
.312 |
| 3/8-16 |
5/16 |
.3120 |
S |
.3480 |
.307/.321 |
.375 |
| 3/8-24 |
Q |
.3320 |
T |
.3580 |
.330/.340 |
.375 |
| 3/8-32 |
11/32 |
.3438 |
* |
* |
.341/.349 |
.375 |
| Tap Size |
Cut Tap Drill |
Roll Tap Drill |
Minor θ |
Major θ |
| 7/16-14 |
U |
.3680 |
13/32 |
.4062 |
.360/.380 |
.437 |
| 7/16-20 |
25/64 |
.3906 |
Z |
.4130 |
.383/.395 |
.437 |
| 7/16-28 |
Y |
.4040 |
* |
* |
.299/.407 |
.437 |
| 1/2-13 |
27/64 |
.4219 |
15/32 |
.4688 |
.417/.434 |
.500 |
| 1/2-20 |
29/64 |
.4531 |
12.25mm |
.4823 |
.446/.457 |
.500 |
| 1/2-28 |
15/32 |
.4688 |
* |
* |
.461/.470 |
.500 |
| 9/16-12 |
31/64 |
.4844 |
17/32 |
.5312 |
.472/.490 |
.562 |
| 9/16-18 |
1/2 |
.500 |
13.5mm |
.5315 |
.502/.515 |
.562 |
| 9/16-24 |
33/64 |
.5156 |
* |
* |
.517/.527 |
.562 |
| 5/8-11 |
17/32 |
.5313 |
14.75mm |
.5807 |
.527/.546 |
.625 |
| 5/8-18 |
9/16 |
.5625 |
15.25mm |
.6004 |
.565/.578 |
.625 |
| 5/8-24 |
37/64 |
.5781 |
* |
* |
.580/.590 |
.625 |
| 11/16-12 |
41/64 |
.6094 |
* |
* |
.597/.615 |
.687 |
| 11/16-24 |
41/64 |
.6406 |
* |
* |
.642/.652 |
.687 |
| 3/4-10 |
21/32 |
.6563 |
45/64 |
.7031 |
.642/.663 |
.750 |
| 3/4-16 |
11/16 |
.6875 |
23/32 |
.7188 |
.682/.696 |
.750 |
| 3/4-20 |
45/64 |
.7031 |
* |
* |
.696/.707 |
.750 |
| 13/16-12 |
47/64 |
.7344 |
* |
* |
.722/.740 |
.812 |
| 13/16-16 |
3/4 |
.750 |
* |
* |
.745/.759 |
.812 |
| 13/16-20 |
49/64 |
.7656 |
* |
* |
.758/.770 |
.812 |
| 7/8-9 |
49/64 |
.7656 |
* |
* |
.755/.778 |
.875 |
| 7/8-14 |
51/64 |
.7969 |
* |
* |
.798/.814 |
.875 |
| 7/8-20 |
53/64 |
.8281 |
* |
* |
.821/.832 |
.875 |
| 15/16-12 |
55/64 |
.8594 |
* |
* |
.847/.865 |
.937 |
| 15/16-16 |
7/8 |
.8750 |
* |
* |
.870/.884 |
.937 |
| 15/16-20 |
57/64 |
.8906 |
* |
* |
.883/.895 |
.937 |
| 1-8 |
7/8 |
.8750 |
* |
* |
.865/.890 |
1 |
| 1-12 |
59/64 |
.9219 |
* |
* |
.910/.928 |
1 |
| 1-20 |
61/64 |
.9531 |
* |
* |
.946/.957 |
1 |
Tap Drill Chart - Metric H6
| Tap Size |
Cut Tap Drill |
Roll Tap Drill |
Minor θ |
Major θ |
| M1.6 x .35 |
1.25 |
.0492 |
1.45 |
.0571 |
1.22/1.321 |
.0481/.0520 |
1.6 |
.0630 |
| M1.8 x .35 |
1.45 |
.0571 |
#51 |
.0670 |
1.371/1.421 |
.0540/.0559 |
1.8 |
.0709 |
| M2 x .4 |
1.6 |
.0630 |
1.8 |
.0709 |
1.567/1.679 |
.0620/.0661 |
2.0 |
.0787 |
| M2.2 x .45 |
1.75 |
.0689 |
2.0 |
.0787 |
1.648/1.713 |
.0649/.0674 |
2.2 |
.0866 |
| M2.5 x .45 |
2.05 |
.0807 |
2.3 |
.0906 |
2.013/2.138 |
.0793/.0842 |
2.5 |
.0984 |
| M3 x .5 |
2.5 |
.0984 |
7/64 |
.1094 |
2.459/2.599 |
.0968/.1023 |
3.0 |
.1181 |
| M3.5 x .6 |
2.9 |
.1142 |
3.2 |
.1260 |
2.850/3.010 |
.1122/.1185 |
3.5 |
.1378 |
| M4 x .7 |
3.3 |
.1299 |
3.7 |
.1457 |
3.242/3.422 |
.1276/.1348 |
4.0 |
.1575 |
| M4.5 x .75 |
3.7 |
.1457 |
4.1 |
.1614 |
3.580/3.688 |
.1406/.1452 |
4.5 |
.1772 |
| M5 x .8 |
4.2 |
.1654 |
#14 |
.182 |
4.134/4.334 |
.1628/.1706 |
5.0 |
.1969 |
| M6 x 1.0 |
5.0 |
.1969 |
7/32 |
.2188 |
4.917/5.153 |
.1936/.2029 |
6.0 |
.2362 |
| M7 x 1.0 |
6.0 |
.2362 |
F |
.2570 |
5.773/5.917 |
.2273/.2330 |
7.0 |
.2756 |
| M8 x 1.25 |
6.7 |
.2638 |
7.4 |
.2913 |
6.647/6.912 |
.2617/.2721 |
8.0 |
.3150 |
| M8 x 1.0 |
7.0 |
.2756 |
19/64 |
.2969 |
6.917/7.153 |
.2723/.2816 |
8.0 |
.3150 |
| M10 x 1.5 |
8.5 |
.3346 |
U |
.3680 |
8.376/8.676 |
.3298/.3416 |
10.0 |
.3937 |
| M10 x 1.25 |
8.7 |
.3425 |
9.4 |
.3701 |
8.647/8.912 |
.3404/.3509 |
10.0 |
.3937 |
| M12 x 1.75 |
10.2 |
.4016 |
11.2 |
.4409 |
10.106/10.441 |
.979/.4111 |
12.0 |
.4724 |
| M12 x 1.25 |
10.8 |
.4252 |
11.5 |
.4528 |
10.647/10.912 |
.4192/.4296 |
14.0 |
.5512 |
| M14 x 2.0 |
12.0 |
.4724 |
33/64 |
.5156 |
11.835/12.210 |
.4659/.4807 |
16.0 |
.6299 |
| M16 x 2.0 |
14.0 |
.5512 |
19/32 |
.5938 |
13.835/14.210 |
.5447/.5594 |
18.0 |
.7087 |
| M16 x 1.5 |
14.5 |
.5709 |
15.25 |
.6007 |
14.376/14.676 |
.5660/.5778 |
18.0 |
.7087 |
| M18 x 2.5 |
15.5 |
.6102 |
39/64 |
.6094 |
14.933/15.394 |
.5879/.6061 |
18.0 |
.7087 |
| M18 x 1.5 |
16.5 |
.6496 |
17.25 |
.6791 |
16.376/16.676 |
.6447/.6565 |
20.0 |
.7874 |
| M20 x 2.5 |
17.5 |
.6890 |
18.75 |
.7382 |
17.294/17.744 |
.6809/.6986 |
20.0 |
.7874 |
| M20 x 1.5 |
18.5 |
.7283 |
19.25 |
.7579 |
18.376/18.676 |
.7235/.7353 |
20.0 |
.7874 |
| M22 x 2.5 |
19.5 |
.7677 |
* |
* |
19.294/19.744 |
.7596/.7773 |
22.0 |
.8661 |
| M22 x 1.5 |
20.5 |
.8071 |
* |
* |
19.294/19.744 |
.7596/.7773 |
22.0 |
.8661 |
| M24 x 3.0 |
21.0 |
.8268 |
* |
* |
20.752/21.252 |
.8170/.8367 |
24.0 |
.9449 |
| M24 x 2.0 |
22.0 |
.8661 |
* |
* |
21.835/22.210 |
.8596/.8744 |
24.0 |
.9449 |
| M27 x 3.0 |
24.0 |
.9449 |
* |
* |
23.752/24.252 |
.9351/.9548 |
27.0 |
1.0630 |
| M27 x 2.0 |
25.0 |
.9843 |
* |
* |
24.835/25.210 |
.9778/.9925 |
27.0 |
1.0630 |
| M30 x 3.5 |
26.5 |
1.0433 |
* |
* |
26.211/26.771 |
1.0319/1.0540 |
30.0 |
1.1811 |
| M30 x 2.0 |
28.0 |
1.1024 |
* |
* |
27.835/28.210 |
1.0959/1.1106 |
30.0 |
1.1811 |
| M33 x 3.5 |
29.5 |
1.1614 |
* |
* |
28.706/29.211 |
1.1302/1.1500 |
33.0 |
1.2992 |
| M33 x 2.0 |
31.0 |
1.2205 |
* |
* |
30.835/31.210 |
1.2140/1.2287 |
33.0 |
1.2992 |
| M36 x 4.0 |
32.0 |
1.2598 |
* |
* |
31.670/32.270 |
1.2469/1.2705 |
36.0 |
1.4173 |
| M36 x 3.0 |
33.0 |
1.2992 |
* |
* |
31.093/31.670 |
1.2241/1.2469 |
36.0 |
1.4173 |
| M39 x 4.0 |
35.0 |
1.3780 |
* |
* |
34.093/34.670 |
1.3422/1.3650 |
39.0 |
1.5354 |
| M39 x 3.0 |
36.0 |
1.4173 |
* |
* |
35.319/35.752 |
1.3905/1.4076 |
39.0 |
1.5354 |
Pipe Tap Drill Chart
| Nominal Pipe Tap Size |
NPT & NPTF |
|
w/o Reamer |
w/ Reamer |
| 1/16-27 |
C |
A |
| 1/8 - 27 |
Q |
21/64 |
| 1/4 - 18 |
7/16 |
27/64 |
| 3/8 - 18 |
9/16 |
9/16 |
| 1/2 - 14 |
45/64 |
11/16 |
| 3/4 - 14 |
29/32 |
57/64 |
| 1 - 11 1/2 |
1 9/64 |
1 1/8 |
| 1 1/4 - 11 1/2 |
1 31/64 |
1 15/32 |
| 1 1/2 - 11 1/2 |
1 23/32 |
1 45/64 |
| 2 - 11 1/2 |
2 3/16 |
2 11/64 |
| Nominal Pipe Tap Size |
NPSM |
NPSC |
NPSF |
| 1/16 - 27 |
- |
1/4 |
D |
| 1/8 - 27 |
T |
Q |
R |
| 1/4 - 18 |
15/32 |
7/16 |
7/16 |
| 3/8 - 18 |
.603 |
37/64 |
37/64 |
| 1/2 - 14 |
19.0mm |
45/64 |
45/64 |
| 3/4 - 14 |
61/64 |
59/64 |
59/64 |
| 1 - 11 1/2 |
1 13/64 |
1 5/32 |
1 5/32 |
| 1 1/4 - 11 1/2 |
1 35/64 |
1 1/2 |
- |
| 1 1/2 - 11 1/2 |
1 25/32 |
1 47/64 |
- |
| 2 - 11 1/2 |
2 1/4 |
2 13/64 |
- |
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