Standard Tap Dimensions, Ground Thread
| NOMINAL DIAMETER RANGE - INCHES |
MACHINE SCREW SIZE NO. |
NOMINAL FRACTIONAL DIAMETER INCHES |
NOMINAL METRIC DIAMETER MILLIMETER |
STYLE* |
TAP DIMENSIONS - INCHES |
| OVER |
TO (INCL.)
| O/A LENGTH A |
THD. LGTH. B |
SQ. LGTH. C |
SHANK DIA. D |
E |
| 0.052 |
0.065 |
0 |
1/16 |
M1.6 |
1 |
1 5/8 |
5/16 |
3/16 |
0.141 |
0.11 |
| 0.065 |
0.078 |
1 |
|
M1.8 |
1 |
1 11/16 |
3/8 |
3/16 |
0.141 |
0.11 |
| 0.078 |
0.091 |
2 |
|
M2, M2.2 |
1 |
1 3/4 |
7/16l |
3/16 |
0.141 |
0.11 |
| 0.091 |
0.104 |
3 |
3/32 |
M2.5 |
1 |
1 13/16 |
1/2 |
3/16r |
0.141 |
0.11 |
| 0.104 |
0.117 |
4 |
|
|
1 |
1 7/8 |
11/16 |
3/16r |
0.141 |
0.11 |
| 0.117 |
0.13 |
5 |
1/8 |
M3, M3.15 |
1 |
1 15/16 |
5/8 |
3/16r |
0.141 |
0.11 |
| 0.13 |
0.145 |
6 |
|
M3.5 |
1 |
2 |
11/16 |
3/16r |
0.141 |
0.11 |
| 0.145 |
0.171 |
8 |
5/32 |
M4 |
1 |
2 1/8 |
3/4 |
1/4 |
0.168 |
0.131 |
| 0.171 |
0.197 |
10 |
3/16 |
M4.5, M5 |
1 |
2 3/8 |
7/8 |
1/4 |
0.194 |
0.152 |
| 0.197 |
0.223 |
12 |
7/32 |
|
1 |
2 3/8 |
15/16 |
11/32 |
0.22 |
0.165 |
| 0.223 |
0.26 |
14 |
1/4 |
M6, M6.3 |
2 |
2 1/2 |
1 |
5/16 |
0.255 |
0.191 |
| 0.26 |
0.323 |
|
5/16 |
M7, M8 |
2 |
2 23/32 |
1 1/8 |
3/8 |
0.318 |
0.238 |
| 0.323 |
0.395 |
|
3/8 |
M10 |
2 |
2 15/16 |
1 1/4 |
7/16 |
0.381 |
0.286 |
| 0.395 |
0.448 |
|
7/16 |
|
3 |
3 5/32 |
1 7/16 |
13/32 |
0.323 |
0.242 |
| 0.448 |
0.51 |
|
1/2 |
M12, M12.5 |
3 |
3 3/8 |
1 21/32 |
7/16 |
0.367 |
0.275 |
| 0.51 |
0.573 |
|
9/16 |
M14 |
3 |
3 19/32 |
1 21/32 |
1/2 |
0.429 |
0.322 |
| 0.573 |
0.635 |
|
5/8 |
M16 |
3 |
3 13/16 |
1 13/16 |
11/16 |
0.48 |
0.36 |
| 0.635 |
0.709 |
|
11/16 |
M18 |
3 |
4 1/32 |
1 13/16 |
5/8 |
0.542 |
0.406 |
| 0.709 |
0.76 |
|
3/4 |
|
3 |
4 1/4 |
2 |
11/16 |
0.59 |
0.442 |
| 0.76 |
0.823 |
|
13/16 |
M20 |
3 |
4 15/32 |
2 |
11/16 |
0.652 |
0.489 |
| 0.823 |
0.885 |
|
7/8l |
M22 |
3 |
4 11/16 |
2 7/32 |
3/4 |
0.697 |
0.523 |
| 0.885 |
0.948 |
|
15/16 |
M24 |
3 |
4 29/32 |
2 7/32 |
3/4 |
0.76 |
0.57 |
| 0.948 |
1.01 |
|
1 |
M25 |
3 |
5 1/8 |
2 1/2 |
13/16 |
0.8 |
0.6 |
| 1.01 |
1.073 |
|
1 1/16 |
M27 |
3 |
5 1/8 |
2 1/2 |
7/8 |
0.896 |
0.672 |
| 1.073 |
1.135 |
|
1 1/8 |
|
3 |
5 7/16 |
2 9/16 |
7/8 |
0.896 |
0.672 |
| 1.135 |
1.198 |
|
1 3/16 |
M30 |
3 |
5 7/16 |
2 9/16 |
1 |
1.021 |
0.766 |
| 1.198 |
1.26 |
|
1 1/4 |
|
3 |
5 3/4 |
2 9/16 |
1 |
1.021 |
0.766 |
| 1.26 |
1.323 |
|
1 5/16 |
M33 |
3 |
5 3/4 |
2 9/16 |
1 1/16 |
1.108 |
0.831 |
| 1.323 |
1.385 |
|
1 3/8 |
|
3 |
6 1/16 |
3 |
1 1/16 |
1.108 |
0.831 |
| 1.385 |
1.448 |
|
1 7/16 |
M36 |
3 |
6 1/16 |
3 |
1 1/8 |
1.233 |
0.925 |
| 1.448 |
1.51 |
|
1 1/2 |
|
3 |
6 3/8 |
3 |
1 1/8 |
1.233 |
0.925 |
| 1.51 |
1.635 |
|
1 5/8 |
M39 |
3 |
6 11/16 |
3 3/16 |
1 1/8 |
1.305 |
0.979 |
| 1.635 |
1.76 |
|
1 3/4 |
M42 |
3 |
7 |
3 3/16 |
1 1/4 |
1.43 |
1.072 |
| 1.76 |
1.885 |
|
1 7/8 |
|
3 |
7 5/16 |
3 9/16 |
1 1/4 |
1.519 |
1.139 |
| 1.885 |
2.01 |
|
2 |
M48 |
3 |
7 5/8 |
3 9/16 |
1 3/8 |
1.644 |
1.233 |
| 2.01 |
2.135 |
|
2 1/8 |
|
3 |
8 |
3 9/16 |
1 3/8 |
1.769 |
1.327 |
| 2.135 |
2.26 |
|
2 1/4 |
M56 |
3 |
8 1/4 |
3 9/16 |
1 7/16 |
1.894 |
1.42 |
| 2.26 |
2.385 |
|
2 3/8 |
|
3 |
8 1/2 |
4 |
1 7/16 |
2.019 |
1.514 |
| 2.385 |
2.51 |
|
2 1/2 |
|
3 |
8 3/4 |
4 |
1 1/2 |
2.1 |
1.575 |
| 2.51 |
2.635 |
|
2 5/8 |
M64 |
3 |
8 3/4 |
4 |
1 1/2 |
2.225 |
1.669 |
| 2.635 |
2.76 |
|
2 3/4 |
|
3 |
9 1/4 |
4 |
1 9/16 |
2.35 |
1.762 |
| 2.76 |
2.885 |
|
2 7/8 |
M72 |
3 |
9 1/4 |
4 |
1 9/16 |
2.475 |
1.856 |
| 2.885 |
3.01 |
|
3 |
|
3 |
9 3/4 |
4 9/16 |
1 5/8 |
2.543 |
1.907 |
| 3.01 |
3.135 |
|
3 1/8 |
|
3 |
9 3/4 |
4 9/16 |
1 5/8 |
2.668 |
2.001 |
| 3.135 |
3.26 |
|
3 1/4 |
M80 |
3 |
10 |
4 9/16 |
1 3/4 |
2.793 |
2.095 |
Styles shown are for Ground Thread Taps.