Fillable Printable Standard Tap Drill Chart
Fillable Printable Standard Tap Drill Chart
Standard Tap Drill Chart
Tap Drill Chart
129
Tap Drill Chart (Standard 2B)
Nominal
Pipe Tap
Size
NPT & NPTF
w/o Reamer w/Reamer
1/16-27 CA
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
Pipe Tap Drill Chart
Nominal
Pipe Tap
Size
NPSM NPSC NPSF
1/16-27 - 1/4 D
1/8-27 TQ 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
-
Tap Drill Chart (Metric H6)
Tap Size Cut Tap Drill Roll Tap Drill Minor Ø Major Ø
0-80 3/64 .0469 1.35mm .0531 .0465/.0514 .060
1-72 #53 .0595 1.7mm .0669 .0580/.0635 .073
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 #26 .1520 .134/.142 .164
8-32 #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 Ø Major Ø
M1.6 x .35 1.25 .0492 1.45 .0571 1.221/1.321 .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/.1347 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 .3979/.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 .6004 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 * * 20.376/20.676 .8022/.8140 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
Tap Size Cut Tap Drill Roll Tap Drill Minor Ø Major Ø
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 39/64 .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
Italics = Metric
* - Form Tap not available or not standard. Check
with Tap Manufacturer for required Drill Size.
