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Thread gauges
for UNC Thread
Gauge steel
Tol. 2 B

| d1 |
P |
| UNC 1/4" - 20 |
20 |
| UNC 5/16" - 18 |
18 |
| UNC 3/8" - 16 |
16 |
| UNC 7/16" - 14 |
14 |
| UNC 1/2" - 13 |
13 |
| UNC 9/16" - 12 |
12 |
| UNC 5/8" - 11 |
11 |
| UNC 3/4" - 10 |
10 |
| UNC 7/8" - 9 |
9 |
| UNC 1" |
8 |
| UNC 1 1/8" - 7 |
7 |
| UNC 1 1/4" - 7 |
7 |
| UNC 1 3/8" - 6 |
6 |
| UNC 1 1/2" - 6 |
6 |
| UNC 1 3/4" - 5 |
5 |
| UNC 2" - 4 |
4 |
| UNC 2 1/4" - 4 |
4 |
| UNC 2 1/2" - 4 |
4 |
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