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Tap Drill Chart
Tap
Size |
Thread Pitch |
Drill Size |
Aluminum |
Mild Steel /
Cast Iron** |
Stainless Steel |
|
N.C. |
N.F. |
Cut Thd. |
Roll Thd. |
RPM* |
HP |
RPM* |
HP |
RPM* |
HP |
|
#0 |
|
80 |
9/64" |
#54 |
3000 |
1/16 |
2000 |
1/16 |
1270 |
1/8 |
|
#2 |
56 |
|
#50 |
5/64" |
3000 |
1/16 |
2000 |
1/16 |
750 |
1/8 |
|
#4 |
40 |
|
#43 |
#39 |
3000 |
1/16 |
2000 |
1/8 |
580 |
1/4 |
|
#6 |
32 |
|
#34 |
1/8" |
3000 |
1/16 |
1870 |
1/8 |
470 |
1/4 |
|
#8 |
32 |
|
#29 |
#25 |
3000 |
1/16 |
1560 |
1/8 |
390 |
1/4 |
|
#10 |
24 |
|
#23 |
11/64" |
1700 |
1/8 |
1360 |
1/4 |
340 |
1/3 |
|
#10 |
|
32 |
#20 |
#16 |
1800 |
1/8 |
1600 |
1/4 |
400 |
1/2 |
|
1/4" |
20 |
|
#6 |
#1 |
1600 |
1/4 |
800 |
1/3 |
200 |
1/2 |
|
1/4" |
|
28 |
#3 |
A |
1800 |
1/4 |
1200 |
1/4 |
300 |
1/3 |
|
5/16" |
18 |
|
G |
7.3mm |
1260 |
1/4 |
640 |
1/3 |
160 |
3/4 |
|
5/16" |
|
24 |
I |
M |
1500 |
1/4 |
960 |
1/3 |
240 |
1/2 |
|
3/8" |
16 |
|
O |
S |
1050 |
1/4 |
530 |
1/2 |
130 |
1 |
|
3/8" |
|
24 |
R |
T |
1300 |
1/4 |
800 |
1/2 |
200 |
3/4 |
|
7/16" |
14 |
|
3/8" |
13/32" |
1200 |
1/3 |
450 |
3/4 |
110 |
1 |
|
1/2" |
13 |
|
27/64" |
15/32" |
800 |
1/3 |
400 |
3/4 |
100 |
1 |
|
1/2" |
|
20 |
29/64" |
31/64" |
1200 |
1/3 |
600 |
3/4 |
150 |
3/4 |
|
5/8" |
11 |
|
17/32" |
15.0mm |
640 |
1/2 |
320 |
1 |
80 |
1-1/2 |
|
5/8" |
|
18 |
37/64" |
19/32" |
975 |
1/2 |
490 |
3/4 |
120 |
1 |
|
3/4" |
10 |
|
21/32" |
45/64" |
540 |
1/2 |
266 |
1 |
66 |
2 |
|
3/4" |
|
16 |
11/16" |
23/32" |
815 |
1/2 |
405 |
1 |
100 |
1-1/2 |
|
7/8" |
9 |
|
49/64" |
-- |
460 |
3/4 |
230 |
1-1/2 |
56 |
2 |
|
1" |
8 |
|
7/8" |
-- |
400 |
3/4 |
200 |
1-1/2 |
50 |
3 |
|
1/16"NPT |
27 |
|
D |
-- |
1500 |
1/8 |
1025 |
1/4 |
380 |
1/3 |
|
1/8"NPT |
27 |
|
R |
-- |
1200 |
1/4 |
900 |
1/2 |
300 |
1/2 |
|
1/4"NPT |
18 |
|
7/16" |
-- |
1000 |
1/2 |
600 |
3/4 |
250 |
1 |
|
3/8"NPT |
18 |
|
37/64" |
-- |
700 |
3/4 |
350 |
1 |
150 |
1-1/2 |
|
1/2"NPT |
14 |
|
23/32" |
-- |
500 |
1 |
250 |
1-1/2 |
90 |
2 |
|
3/4"NPT |
14 |
|
59/64" |
-- |
350 |
1-1/2 |
175 |
2 |
50 |
3 |
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Note: Pipe tap drill size without taper pipe reamer. |
|
* RPM not to exceed maximum of tapping head. |
|
** SAE 1020 / 1112, Hardness: 217 BHN / 20 Rc |
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