| INCH SIZES - NATIONAL COARSE |
| TAP SIZE |
DRILL SIZE |
| #0-80 |
3/64" |
| #1-64 |
#53 |
| #2-56 |
#51 |
| #3-48 |
5/64" |
| #4-40 |
#43 |
| #5-40 |
#39 |
| #6-32 |
#36 |
| #8-32 |
#29 |
| #10-24 |
#25 |
| #12-24 |
#17 |
| 1/4-20 |
#7 |
| 5/16-18 |
F |
| 3/8-16 |
5/16 |
| 7/16-14 |
U |
| 1/2-13 |
27/64 |
| 9/16-12 |
31/64 |
| 5/8-11 |
17/32 |
| 3/4-10 |
21/32 |
| 7/8-9 |
49/64 |
| 1"-8 |
7/8 |
| 1-1/8-7 |
63/64 |
| 1-1/4-7 |
1-7/64 |
| 1-1/2-6 |
1-11/32 |
| 1-3/4-5 |
1-35/64 |
| 2"-4-1/2 |
1-25/32 |
|
| INCH SIZES - NATIONAL FINE |
| TAP SIZE |
DRILL SIZE |
| #1-72 |
#53 |
| #2-64 |
#50 |
| #3-56 |
#46 |
| #4-48 |
#42 |
| #5-44 |
#37 |
| #6-40 |
#33 |
| #8-36 |
#29 |
| #10-32 |
#21 |
| #12-28 |
#15 |
| 1/4-28 |
#3 |
| 5/16-24 |
I |
| 3/8-24 |
Q |
| 7/16-20 |
W |
| 1/2-20 |
29/64 |
| 9/16-18 |
33/64 |
| 5/8-18 |
37/64 |
| 3/4-16 |
11/16 |
| 7/8-14 |
13/16 |
| 1"-12 |
15/16 |
| 1-1/8-12 |
1-3/64 |
| 1-1/4-12 |
1-11/64 |
| 1-1/2-12 |
1-27/64 |
| 1-3/4-12 |
1-43/64 |
| 2"-12 |
1-59/64 |
|
| TAPER PIPE SIZES - NPT |
| TAP SIZE |
DRILL SIZE |
| 1/8-27 |
R |
| 1/4-18 |
7/16 |
| 3/8-18 |
37/64 |
| 1/2-14 |
23/32 |
| 3/4-14 |
59/64 |
| 1"-11-1/2 |
1-5/32 |
| 1-1/4-11-1/2 |
1-1/2 |
| 1-1/2-11-1/2 |
1-47/64 |
| 2"-11-1/2 |
2-7/32 |
| 2-1/2-8 |
2-5/8 |
| 3"-8 |
3-1/4 |
| 3-1/2-8 |
3-3/4 |
| 4"-8 |
4-1/4 |
|
| STRAIGHT PIPE SIZES - NPS |
| TAP SIZE |
DRILL SIZE |
| 1/8-27 |
S |
| 1/4-18 |
29/64 |
| 3/8-18 |
19/32 |
| 1/2-14 |
47/64 |
| 3/4-14 |
15/16 |
| 1"-11-1/2 |
1-3/16 |
| 1-1/4-11-1/2 |
1-33/64 |
| 1-1/2-11-1/2 |
1-3/4 |
| 2"-11-1/2 |
2-7/32 |
| 2-1/2-8 |
2-21/32 |
| 3"-8 |
3-9/32 |
| 3-1/2-8 |
3-25/32 |
| 4"-8 |
4-9/32 |
|
| METRIC COARSE SIZES |
| TAP SIZE |
DRILL SIZE |
| 1mm x .25 |
.75mm |
| 1.1 x .25 |
.85 |
| 1.2 x .25 |
.95 |
| 1.4 x .3 |
1.1 |
| 1.6 x .35 |
1.25 |
| 1.7 x .35 |
1.3 |
| 1.8 x .35 |
1.45 |
| 2 x .4 |
1.6 |
| 2.2 x .45 |
1.75 |
| 2.5 x .45 |
2.05 |
| 3 x .5 |
2.5 |
| 3.5 x .6 |
2.9 |
| 4 x .7 |
3.3 |
| 4.5 x .75 |
3.7 |
| 5 x .8 |
4.2 |
| 6 x 1 |
5 |
| 7 x 1 |
6 |
| 8 x 1.25 |
6.8 |
| 9 x 1.25 |
7.8 |
| 10 x 1.5 |
8.5 |
| 11 x 1.5 |
9.5 |
| 12 x 1.75 |
10.2 |
| 14 x 2 |
12 |
| 16 x 2 |
14 |
| 18 x 2.5 |
15.5 |
| 20 x 2.5 |
17.5 |
| 22 x 2.5 |
19.5 |
| 24 x 3 |
21 |
| 27 x 3 |
24 |
| 30 x 3.5 |
26.5 |
| 33 x 3.5 |
29.5 |
| 36 x 4 |
32 |
| 39 x 4 |
35 |
|
| METRIC FINE SIZES |
| TAP SIZE |
DRILL SIZE |
| 4 mm x .35 |
3.6mm |
| 4 x .5 |
3.5 |
| 5 x .5 |
4.5 |
| 6 x .5 |
5.5 |
| 6 x .75 |
5.25 |
| 7 x .75 |
6.25 |
| 8 x .5 |
7 |
| 8 x .75 |
7.25 |
| 8 x 1 |
7.5 |
| 9 x 1 |
8 |
| 10 x .75 |
9.25 |
| 10 x 1 |
9 |
| 10 x 1.25 |
8.8 |
| 11 x 1 |
10 |
| 12 x .75 |
11.25 |
| 12 x 1 |
11 |
| 12 x 1.5 |
10.5 |
| 14 x 1 |
13 |
| 14 x 1.25 |
12.8 |
| 14 x 1.5 |
12.5 |
| 16 x 1 |
15 |
| 16 x 1.5 |
14.5 |
| 18 x 1 |
17 |
| 18 x 2 |
16 |
| 20 x 1 |
19 |
| 20 x 1.5 |
18.5 |
| 20 x 2 |
18 |
| 22 x 1 |
21 |
| 22 x 1.5 |
20.5 |
| 22 x 2 |
20 |
| 24 x 1.5 |
22.5 |
| 24 x 2 |
22 |
| 26 x 1.5 |
24.5 |
| 27 x 1.5 |
25.5 |
| 27 x 2 |
25 |
| 28 x 1.5 |
26.5 |
| 30 x 1.5 |
28.5 |
| 30 x 2 |
28 |
| 33 x 2 |
31 |
| 36 x 3 |
33 |
| 39 x 3 |
36 |
|
