Tap Drill Reference
|
Imperial Tap Drill Chart
|
| Machine Screw Size |
Number of Threads Per Inch |
Minor Dia. |
Tap Drills |
Clearance Hole Drills |
Aluminum, Brass & Plastics
75% Thread
|
Stainless Steel, Steels & Iron
50% Thread
|
All Materials |
| Close Fit |
Free Fit |
| No. or Dia. |
Major Dia. |
Drill Size |
Decimal Equiv. |
Drill Size |
Decimal Equiv. |
Drill Size |
Decimal Equiv. |
Drill Size |
Decimal Equiv. |
| 0 |
.0600 |
80 |
.0447 |
3/64 |
.0469 |
55 |
.0520 |
52 |
.0635 |
50 |
.0700 |
| 1 |
.0730 |
64 |
.0538 |
53 |
.0595 |
1/16 |
.0625 |
48 |
.0760 |
46 |
.0810 |
| 72 |
.0560 |
53 |
.0595 |
52 |
.0635 |
| 2 |
.0860 |
56 |
.0641 |
50 |
.0700 |
49 |
.0730 |
43 |
.0890 |
41 |
.0960 |
| 64 |
.0668 |
50 |
.0700 |
48 |
.0760 |
| 3 |
.0990 |
48 |
.0734 |
47 |
.0785 |
44 |
.0860 |
37 |
.1040 |
35 |
.1100 |
| 56 |
.0771 |
45 |
.0820 |
43 |
.0890 |
| 4 |
.1120 |
40 |
.0813 |
43 |
.0890 |
41 |
.0960 |
32 |
.1160 |
30 |
.1285 |
| 48 |
.0864 |
42 |
.0935 |
40 |
.0980 |
| 5 |
.1250 |
40 |
.0943 |
38 |
.1015 |
7/64 |
.1094 |
30 |
.1285 |
29 |
.1360 |
| 44 |
.0971 |
37 |
.1040 |
35 |
.1100 |
| 6 |
.1380 |
32 |
.0997 |
36 |
.1065 |
32 |
.1160 |
27 |
.1440 |
25 |
.1495 |
| 40 |
.1073 |
33 |
.1130 |
31 |
.1200 |
| 8 |
.1640 |
32 |
.1257 |
29 |
.1360 |
27 |
.1440 |
18 |
.1695 |
16 |
.1770 |
| 36 |
.1299 |
29 |
.1360 |
26 |
.1470 |
| 10 |
.1900 |
24 |
.1389 |
25 |
.1495 |
20 |
.1610 |
9 |
.1960 |
7 |
.2010 |
| 32 |
.1517 |
21 |
.1590 |
18 |
.1695 |
| 12 |
.2160 |
24 |
.1649 |
16 |
.1770 |
12 |
.1890 |
2 |
.2210 |
1 |
.2280 |
| 28 |
.1722 |
14 |
.1820 |
10 |
.1935 |
| 32 |
.1777 |
13 |
.1850 |
9 |
.1960 |
| 1/4 |
.2500 |
20 |
.1887 |
7 |
.2010 |
7/32 |
.2188 |
F |
.2570 |
H |
.2660 |
| 28 |
.2062 |
3 |
.2130 |
1 |
.2280 |
| 32 |
.2117 |
7/32 |
.2188 |
1 |
.2280 |
| 5/16 |
.3125 |
18 |
.2443 |
F |
.2570 |
J |
.2770 |
P |
.3230 |
Q |
.3320 |
| 24 |
.2614 |
I |
.2720 |
9/32 |
.2812 |
| 32 |
.2742 |
9/32 |
.2812 |
L |
.2900 |
| 3/8 |
.3750 |
16 |
.2983 |
5/16 |
.3125 |
Q |
.3320 |
W |
.3860 |
X |
.3970 |
| 24 |
.3239 |
Q |
.3320 |
S |
.3480 |
| 32 |
.3367 |
11/32 |
.3438 |
T |
.3580 |
|
7/16
|
.4375
|
14 |
.3499 |
U |
.3680 |
25/64 |
.3906 |
29/64
|
.4531
|
15/32
|
.4687
|
| 20 |
.3762 |
25/64 |
.3906 |
13/32 |
.4062 |
| 28 |
.3937 |
Y |
.4040 |
Z |
.4130 |
| 1/2 |
.5000 |
13 |
.4056 |
27/64 |
.4219 |
29/64 |
.4531 |
33/64 |
.5156 |
17/32 |
.5312 |
| 20 |
.4387 |
29/64 |
.4531 |
15/32 |
.4688 |
| 28 |
.4562 |
15/32 |
.4688 |
15/32 |
.4688 |
| 9/16 |
.5625 |
12 |
.4603 |
31/64 |
.4844 |
33/64 |
.5156 |
37/64 |
.5781 |
19/32 |
.5938 |
| 18 |
.4943 |
33/64 |
.5156 |
17/32 |
.5312 |
| 24 |
.5114 |
33/64 |
.5156 |
17/32 |
.5312 |
| 5/8 |
.6250 |
11 |
.5135 |
17/32 |
.5312 |
9/16 |
.5625 |
41/64 |
.6406 |
21/32 |
.6562 |
| 18 |
.5568 |
37/64 |
.5781 |
19/32 |
.5938 |
| 24 |
.5739 |
37/64 |
.5781 |
19/32 |
.5938 |
| 11/16 |
.6875 |
24 |
.6364 |
41/64 |
.6406 |
21/32 |
.6562 |
45/64 |
.7031 |
23/32 |
.7188 |
|
3/4
|
.7500
|
10 |
.6273 |
21/32 |
.6562 |
11/16 |
.6875 |
49/64
|
.7656
|
25/32
|
.7812
|
| 16 |
.6733 |
11/16 |
.6875 |
45/64 |
.7031 |
| 20 |
.6887 |
45/64 |
.7031 |
23/32 |
.7188 |
| 1-3/16 |
.8125 |
20 |
.7512 |
49/64 |
.7656 |
25/32 |
.7812 |
53/64 |
.8281 |
27/32 |
.8438 |
| 7/8 |
.8750 |
9 |
.7387 |
49/64 |
.7656 |
51/64 |
.7969 |
57/64 |
.8906 |
29/32 |
.9062 |
| 14 |
.7874 |
13/16 |
.8125 |
53/64 |
.8281 |
| 20 |
.8137 |
53/64 |
.8281 |
27/32 |
.8438 |
| 15/16 |
.9375 |
20 |
.8762 |
57/64 |
.8906 |
29/32 |
.9062 |
61/64 |
.9531 |
31/32 |
.9688 |
| 1 |
1.000 |
8 |
.8466 |
7/8 |
.8750 |
59/64 |
.9219 |
1-1/64 |
1.0156 |
1-1/32 |
1.0313 |
| 12 |
.8978 |
15/16 |
.9375 |
61/64 |
.9531 |
| 20 |
.9387 |
61/64 |
.9531 |
31/32 |
.9688 |
| 1-1/16 |
1.0625 |
18 |
.9943 |
1.000 |
1.000 |
1-1/64 |
1.0156 |
1-5/64 |
1.0781 |
1-3/32 |
1.0938 |
| 1-1/8 |
1.1250 |
7 |
.9497 |
63/64 |
.9844 |
1-1/32 |
1.0313 |
1-9/64 |
1.1406 |
1-5/32 |
1.1562 |
| 12 |
1.0228 |
1-3/64 |
1.0469 |
1-5/64 |
1.0781 |
| 18 |
1.0568 |
1-1/16 |
1.0625 |
1-5/64 |
1.0781 |
| 1-3/16 |
1.1875 |
18 |
1.1193 |
1-1/8 |
1.1250 |
1-9/64 |
1.1406 |
1-13/64 |
1.2031 |
1-7/32 |
1.2188 |
|
1-1/4
|
1.2500
|
7 |
1.0747 |
1-7/64 |
1.1094 |
1-5/32 |
1.1562 |
1-17/64
|
1.2656
|
1-9/32
|
1.2812
|
| 12 |
1.1478 |
1-11/64 |
1.1719 |
1-13/64 |
1.2031 |
| 18 |
1.1818 |
1-3/16 |
1.1875 |
1-13/64 |
1.2031 |
| 1-5/16 |
1.3125 |
18 |
1.2443 |
1-1/4 |
1.2500 |
1-17/64 |
1.2656 |
1-21/64 |
1.3281 |
1-11/32 |
1.3438 |
| 1-3/8 |
1.3750 |
6 |
1.1705 |
1-7/32 |
1.2187 |
1-17/64 |
1.2656 |
1-25/64 |
1.3906 |
1-13/32 |
1.4062 |
| 12 |
1.2728 |
1-19/64 |
1.2969 |
1-21/64 |
1.3281 |
| 18 |
1.3068 |
1-5/16 |
1.3125 |
1-21/64 |
1.3281 |
| 1-7/16 |
1.4375 |
18 |
1.3693 |
1-3/8 |
1.3750 |
1-25/64 |
1.3906 |
1-29/64 |
1.4531 |
1-15/32 |
1.4688 |
| 1-1/2 |
1.500 |
6 |
1.2955 |
1-11/32 |
1.3437 |
1-25/64 |
1.3906 |
1-33/64 |
1.5156 |
1-17/32 |
1.5312 |
| 12 |
1.3978 |
1-27/64 |
1.4219 |
1-7/16 |
1.4375 |
| 18 |
1.4318 |
1-7/16 |
1.4375 |
1-29/64 |
1.4531 |
| 1-9/16 |
1.5625 |
18 |
1.4943 |
1-12 |
1.500 |
1-33/64 |
1.5156 |
1-37/64 |
1.5781 |
1-19/32 |
1.5938 |
| 1-5/8 |
1.625 |
18 |
1.5568 |
1-9/16 |
1.5625 |
1-37/64 |
1.5781 |
1-41/64 |
1.6406 |
1-21/32 |
1.6562 |
| 1-11/16 |
1.6875 |
18 |
1.6193 |
1-5/8 |
1.6250 |
1-41/64 |
1.6406 |
1-45/64 |
1.7031 |
1-23/32 |
1.7188 |
| 1-3/4 |
1.750 |
5 |
1.5046 |
1-9/16 |
1.5625 |
1-5/8 |
1.6250 |
1-49/64 |
1.7659 |
1-25/32 |
1.7812 |
Metric Tap Drill Chart
|
| Tap size |
Major
Dia (mm) |
Threads
per |
Tap Drill
(mm) |
Tap Drill
(inch) |
Clearance
(mm) |
Clearance
(inch) |
| M1.6x0.35 |
1.6
|
0.35 |
1.25
|
#55 |
1.8 |
#49 |
| M2x0.4 |
2.0
|
0.40 |
1.60 |
#52 |
2.4 |
#41 |
| M2.5x0.45 |
2.5
|
0.45 |
2.05
|
#46 |
2.9 |
#32 |
| M3x.05 |
3.0
|
0.50 |
2.50 |
#39 |
3.4 |
#29 |
| M3.5x0.6 |
3.5 |
0.60 |
2.90 |
#32 |
3.9 |
#23 |
| M4x0.7 |
4.0 |
0.70 |
3.30 |
#30 |
4.5 |
#16 |
| M5x0.8 |
5.0 |
0.80 |
4.20 |
#19 |
5.5 |
7/32 |
| M6x1 |
6.0 |
1.00 |
5.0 |
#8 |
6.6 |
G |
| M8x1.25 |
8.0 |
1.25 |
6.8 |
H |
9.0 |
T |
| M8x1 |
8.0 |
1.00 |
7.0 |
J |
9.0 |
T |
| M10x1.5 |
10.0 |
1.50 |
8.5 |
R |
12.0 |
31/64 |
| M10x1.25 |
10.0 |
1.25 |
8.8 |
11/32 |
12.0 |
31/64 |
| M12x1.75 |
12.0 |
1.75 |
10.2 |
13/32 |
14.0 |
35/64 |
| M12x1.25 |
12.0 |
1.25 |
10.8 |
27/64 |
14.0 |
35/64 |
| M14x2 |
14.0 |
2.00 |
12.0 |
15/32 |
16.0 |
5/8 |
| M14x1.5 |
14.0 |
1.5 |
12.5 |
1/2 |
16.0 |
5/8 |
| M16x2 |
16.0 |
2.00 |
14.0 |
35/64 |
18.0 |
45/64 |
| M16x1.5 |
16.0 |
1.50 |
14.5 |
37/64 |
18.0 |
45/64 |
| M18x2.5 |
18.0 |
2.50 |
15.5 |
39/64 |
20.0 |
51/64 |
| M18x1.5 |
18.0 |
1.50 |
16.5 |
21/32 |
20.0 |
51/64 |
| M20x2.5 |
20.0 |
2.50 |
17.5 |
11/16 |
22.0 |
7/8 |
| M20x1.5 |
20.0 |
1.50 |
18.5 |
47/64 |
22.0 |
7/8 |
| M22x2.5 |
22.0 |
2.50 |
19.5 |
49/64 |
25.0 |
1 |
| M22x1.5 |
22.0 |
1.50 |
20.5 |
13/16 |
25.0 |
1 |
| M24x3 |
24.0 |
3.00 |
21.0 |
53/64 |
27.0 |
1-5/64 |
| M24x2 |
24.0 |
2.00 |
22.0 |
7/8 |
27.0 |
1-5/64 |
| M27x3 |
27.0 |
3.00 |
24.0 |
15/16 |
30.0 |
1-3/16 |
| M27x2 |
27.0 |
2.0 |
25.0 |
1 |
30.0 |
1-3/16 |
Pipe Threads
|
| - |
American Standard |
British Standard |
Nominal
OD |
Threads
per inch |
NPT |
NPS |
Threads
per inch |
Drill
size |
| 1/16 |
27 |
D |
1/4 |
28 |
G |
| 1/8 |
27 |
R |
S |
28 |
11/32 |
| 1/4 |
18 |
7/16 |
29/64 |
19 |
15/32 |
| 3/8 |
18 |
37/64 |
19/32 |
19 |
39/64 |
| 1/2 |
14 |
23/32 |
47/64 |
14 |
3/4 |
| 5/8 |
- |
- |
- |
14 |
53/64 |
| 3/4 |
14 |
59/64 |
15/16 |
14 |
31/32 |
| 7/8 |
- |
- |
- |
14 |
1-7/64 |
| 1 |
11.5 |
1-5/32 |
1-3/16 |
11 |
1-7/32 |
|
|
Drill Chart -
Standard Drill Sizes / Millimeter Sizes
|
|
(See typical tolerances of drilled holes at bottom of
page)
Drill
(in.) |
Decimal |
Drill
(in.) |
Decimal |
Drill
(in.) |
Decimal |
Drill
(mm) |
Decimal
(in.) |
Drill
(mm) |
Decimal
(in.) |
Drill
(mm) |
Decimal
(in.) |
| 80 |
.0135 |
1/8 |
.1250 |
O |
.3160 |
.35 |
.0138 |
3.4 |
.1339 |
8.0 |
.3150 |
| 79 |
.0145 |
30 |
.1285 |
P |
.3230 |
.4 |
.0157 |
3.5 |
.1378 |
8.1 |
.3189 |
| 1/64 |
.0156 |
29 |
.1360 |
21/64 |
.3281 |
.45 |
.0177 |
3.6 |
.1417 |
8.2 |
.3228 |
| 78 |
.0160 |
28 |
.1405 |
Q |
.3320 |
.5 |
.0197 |
3.7 |
.1457 |
8.25 |
.3248 |
| 77 |
.0180 |
9/64 |
.1406 |
R |
.3390 |
.55 |
.0217 |
3.75 |
.1477 |
8.3 |
.3267 |
| 76 |
.0200 |
27 |
.1440 |
11/32 |
.3437 |
.6 |
.0236 |
3.8 |
.1496 |
8.4 |
.3307 |
| 75 |
.0210 |
26 |
.1470 |
S |
.3480 |
.65 |
.0256 |
3.9 |
.1535 |
8.5 |
.3346 |
| 74 |
.0225 |
25 |
.1495 |
T |
.3580 |
.7 |
.0276 |
4.0 |
.1575 |
8.6 |
.3386 |
| 73 |
.0240 |
24 |
.1520 |
23/64 |
.3594 |
.75 |
.0295 |
4.1 |
.1614 |
8.7 |
.3425 |
| 72 |
.0250 |
23 |
.1540 |
U |
.3680 |
.8 |
.0315 |
4.2 |
.1654 |
8.75 |
.3445 |
| 71 |
.0260 |
5/32 |
.1562 |
3/8 |
.3750 |
.85 |
.0335 |
4.25 |
.1674 |
8.8 |
.3465 |
| 70 |
.0280 |
22 |
.1570 |
V |
.3770 |
.9 |
.0355 |
4.3 |
.1693 |
8.9 |
.3504 |
| 69 |
.0292 |
21 |
.1590 |
W |
.3860 |
.95 |
.0374 |
4.4 |
.1732 |
9.0 |
.3543 |
| 68 |
.0310 |
20 |
.1610 |
25/64 |
.3906 |
1.0 |
.0394 |
4.5 |
.1771 |
9.1 |
.3583 |
| 1/32 |
.0313 |
19 |
.1660 |
X |
.3970 |
1.05 |
.0413 |
4.6 |
.1811 |
9.2 |
.3622 |
| 67 |
.0320 |
18 |
.1695 |
Y |
.4040 |
1.1 |
.0433 |
4.7 |
.1850 |
9.25 |
.3642 |
| 66 |
.0330 |
11/64 |
.1719 |
13/32 |
.4062 |
1.15 |
.0453 |
4.75 |
.1870 |
9.35 |
.3661 |
| 65 |
.0350 |
17 |
.1730 |
Z |
.4130 |
1.2 |
.0472 |
4.8 |
.1890 |
9.4 |
.3701 |
| 64 |
.0360 |
16 |
.1770 |
27/64 |
.4219 |
1.25 |
.0492 |
4.9 |
.1929 |
9.5 |
.3740 |
| 63 |
.0370 |
15 |
.1800 |
7/16 |
.4375 |
1.3 |
.0512 |
5.0 |
.1968 |
9.6 |
.3780 |
| 62 |
.0380 |
14 |
.1820 |
29/64 |
.4531 |
1.35 |
.0531 |
5.1 |
.2008 |
9.7 |
.3819 |
| 61 |
.0390 |
13 |
.1850 |
15/32 |
.4687 |
1.4 |
.0551 |
5.2 |
.2047 |
9.75 |
.3839 |
| 60 |
.0400 |
3/16 |
.1875 |
31/64 |
.4844 |
1.45 |
.0571 |
5.25 |
.2067 |
9.8 |
.3858 |
| 59 |
.0410 |
12 |
.1890 |
½ |
.5000 |
1.5 |
.0591 |
5.3 |
.2087 |
9.9 |
.3898 |
| 58 |
.0420 |
11 |
.1910 |
33/64 |
.5156 |
1.55 |
.0610 |
5.4 |
.2126 |
10.0 |
.3937 |
| 57 |
.0430 |
10 |
.1935 |
17/32 |
.5312 |
1.6 |
.0629 |
5.5 |
.2165 |
10.5 |
.4133 |
| 56 |
.0465 |
9 |
.1960 |
35/64 |
.5469 |
1.65 |
.0650 |
5.6 |
.2205 |
11.0 |
.4331 |
| 3/64 |
.0469 |
8 |
.1990 |
9/16 |
.5625 |
1.7 |
.0669 |
5.7 |
.2244 |
11.5 |
.4528 |
| 55 |
.0520 |
7 |
.2010 |
37/64 |
.5781 |
1.75 |
.0689 |
5.75 |
.2264 |
12.0 |
.4724 |
| 54 |
.0550 |
13/64 |
.2031 |
19/32 |
.5937 |
1.8 |
.0709 |
5.8 |
.2283 |
12.5 |
.4921 |
| 53 |
.0595 |
6 |
.2040 |
39/64 |
.6094 |
1.85 |
.0728 |
5.9 |
.2323 |
13.0 |
.5118 |
| 1/16 |
.0625 |
5 |
.2055 |
5/8 |
.6250 |
1.9 |
.0748 |
6.0 |
.2362 |
13.5 |
.5315 |
| 52 |
.0635 |
4 |
.2090 |
41/64 |
.6406 |
1.95 |
.0768 |
6.1 |
.2401 |
14.0 |
.5512 |
| 51 |
.0670 |
3 |
.2130 |
21/32 |
.6562 |
2.0 |
.0787 |
6.2 |
.2441 |
14.5 |
.5708 |
| 50 |
.0700 |
7/32 |
.2187 |
43/64 |
.6719 |
2.05 |
.0807 |
6.25 |
.2461 |
15.0 |
.5906 |
| 49 |
.0730 |
2 |
.2210 |
11/16 |
.6875 |
2.1 |
.0827 |
6.3 |
.2480 |
15.5 |
.6102 |
| 48 |
.0760 |
1 |
.2280 |
45/64 |
.7031 |
2.15 |
.0846 |
6.4 |
.2520 |
16.0 |
.6300 |
| 5/64 |
.0781 |
A |
.2340 |
23/32 |
.7187 |
2.2 |
.0866 |
6.5 |
.2559 |
16.5 |
.6496 |
| 47 |
.0785 |
15/64 |
.2344 |
47/64 |
.7344 |
2.25 |
.0886 |
6.6 |
.2598 |
17.0 |
.6693 |
| 46 |
.0810 |
B |
.2380 |
¾ |
.7500 |
2.3 |
.0905 |
6.7 |
.2638 |
17.5 |
.6889 |
| 45 |
.0820 |
C |
.2420 |
49/64 |
.7656 |
2.35 |
.0925 |
6.75 |
.2658 |
18.0 |
.7087 |
| 44 |
.0860 |
D |
.2460 |
25/32 |
.7812 |
2.4 |
.0945 |
6.8 |
.2677 |
18.5 |
.7283 |
| 43 |
.0890 |
E |
.2500 |
51/64 |
.7969 |
2.45 |
.0965 |
6.9 |
.2716 |
19.0 |
.7480 |
| 42 |
.0935 |
¼ |
.2500 |
13/16 |
.8125 |
2.5 |
.0984 |
7.0 |
.2756 |
19.5 |
.7677 |
| 3/32 |
.0937 |
F |
.2570 |
53/64 |
.8281 |
2.55 |
.1004 |
7.1 |
.2795 |
20.0 |
.7874 |
| 41 |
.0960 |
G |
.2610 |
27/32 |
.8437 |
2.6 |
.1024 |
7.2 |
.2835 |
20.5 |
.8071 |
| 40 |
.0980 |
17/64 |
.2656 |
55/64 |
.8594 |
2.65 |
.1043 |
7.25 |
.2855 |
21.0 |
.8268 |
| 39 |
.0995 |
H |
.2660 |
7/8 |
.8750 |
2.7 |
.1063 |
7.3 |
.2874 |
21.5 |
.8465 |
| 38 |
.1015 |
I |
.2720 |
57/64 |
.8906 |
2.75 |
.1083 |
7.4 |
.2913 |
22.0 |
.8661 |
| 37 |
.1040 |
J |
.2770 |
29/32 |
.9062 |
2.8 |
.1102 |
7.5 |
.2953 |
22.5 |
.8858 |
| 36 |
.1065 |
K |
.2811 |
59/64 |
.9219 |
2.9 |
.1142 |
7.6 |
.2990 |
23.0 |
.9055 |
| 7/64 |
.1093 |
9/32 |
.2812 |
15/16 |
.9375 |
3.0 |
.1181 |
7.7 |
.3031 |
23.5 |
.9252 |
| 35 |
.1100 |
L |
.2900 |
61/64 |
.9531 |
3.1 |
.1220 |
7.75 |
.3051 |
24.0 |
.9449 |
| 34 |
.1110 |
M |
.2950 |
31/32 |
.9687 |
3.2 |
.1260 |
7.8 |
.3071 |
24.5 |
.9646 |
| 33 |
.1130 |
19/64 |
.2968 |
63/64 |
.9844 |
3.25 |
.1280 |
7.9 |
.3110 |
25.0 |
.9843 |
| 32 |
.1160 |
N |
.3020 |
1 |
1.000 |
3.3 |
.1299 |
|
|
|
|
| 31 |
.1200 |
5/16 |
.3125 |
|
|
|
|
|
|
|
|
HOLE DIA
TOLERANCE-STANDARD DRILLED HOLE
TOLERANCES
.0135 THRU .125 +.004/ -.001
FOR HOLES DRILLED WITH A
DRILLING
.1260 THRU .25 +.005/ -.001
MACHINE USING SUITABLE JIGS AND
.
.2510 THRU .500
+.006/-.001
FIXTURES, THE HOLE TOLERANCES
DE-
.5010 THRU .750 +.008/ -.001
PEND UPON THE DIAMETER OF THE
HOLE
.7510 THRU 1.000 +.010/ -.001
AND INCREASE AS THE HOLE
DIAMETER
1 .001 THRU 2.000 +.012/ -.001
INCREASES. THE FOLLOWING ARE
STANDARD
TOLERANCES
FOR GENERAL
MACHINE
WORK
AND APPLY IN ALL CASES EXCEPT
WHERE GREATER OR LESSER ACCURACY
IS
REQUIRED
BY THE DESIGN.
|
|
|
http://www.physics.ncsu.edu/pearl/Tap_Drill_Chart.html
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