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| nominal size |
threads per inch |
A max. |
H max. |
D max. |
d max. |
L length on production |
B min. |
S nom. |
T min. |
recommended seating torque (Ibf.ft) |
|---|---|---|---|---|---|---|---|---|---|---|
| 1/4UNC | 20 | 0.375 | 0.2500 | 0.2500 | 0.2490 | 1"1/2-4" | 1.00 | 3/16 | 0.120 | 13.8 |
| 5/16UNC | 18 | 0.469 | 0.3125 | 0.3125 | 0.3113 | 1"3/4-6" | 1.12 | 1/4 | 0.151 | 28.5 |
| 3/8UNC | 16 | 0.562 | 0.3750 | 0.3750 | 0.3737 | 1"3/4-6" | 1.25 | 5/16 | 0.182 | 50.6 |
| 1/2UNC | 13 | 0.750 | 0.5000 | 0.5000 | 0.4985 | 2"1/2-6" | 1.50 | 3/8 | 0.245 | 123.5 |
| 5/8UNC | 11 | 0.938 | 0.6250 | 0.6250 | 0.6234 | 2"1/2-6" | 1.75 | 1/2 | 0.307 | 232.5 |
| 3/4UNC | 10 | 1.125 | 0.7500 | 0.7500 | 0.7482 | 3"-6" | 2.00 | 5/8 | 0.370 | 412.5 |
| 1/2BSW | 12 | 0.750 | 0.5000 | 0.5000 | 0.4985 | 2"1/2-6" | 1.50 | 3/8 | 0.245 | 123.5 |
nominal size |
1/4UNC | 5/16UNC | 3/8UNC | 1/2UNC |
|---|---|---|---|---|
threads per inch |
20 | 18 | 16 | 16 |
| A max. |
0.375 | 0.469 | 0.562 | 0.750 |
| H max. |
0.2500 | 0.3125 | 0.3750 | 0.5000 |
| D max. |
0.2500 | 0.3125 | 0.3750 | 0.5000 |
| d max. |
0.2490 | 0.3113 | 0.3737 | 0.4985 |
| L length on production |
1"1/2-4" | 1"3/4-6" | 1"3/4-6" | 2"1/2-6" |
| B min. |
1.00 | 1.12 | 1.25 | 1.50 |
| S nom. |
3/16 | 1/4 | 5/16 | 3/8 |
| T min. |
0.120 | 0.151 | 0.182 | 0.245 |
| recommended seating torque (Ibf.ft) |
13.8 | 28.5 | 50.6 | 123.5 |
nominal thread size |
5/8UNC | 3/4UNC | 1/2BSW | |
|---|---|---|---|---|
pitch |
10 | 10 | 12 | |
| A min. |
0.938 | 1.125 | 0.750 | |
| H max. |
0.6234 | 0.7500 | 0.5000 | |
| D max. |
0.6234 | 0.7500 | 0.5000 | |
| d max. |
0.6234 | 0.7482 | 0.4958 | |
| L length on production |
2"1/2-6" | 3"-6" | 2"1/2-6" | |
| B min. |
1.75 | 2.00 | 1.50 | |
| S nom. |
1/2 | 5/8 | 3/8 | |
| T min. |
0.307 | 0.370 | 0.245 | |
| recommended seating torque (Ibf.ft) |
232.5 | 412.5 | 123.5 |