Gauge Code

Thread/Perinch

1/4-16acme

16

5/16-14acme

14

3/8-12acme

12

7/16-12acme

12

1/2-10acme

10

5/8-8acme

8

3/4-6acme

6

7/8-6acme

6

1-5acme

5

1 1/8-5acme

5

1 1/4-5acme

5

1 3/8-4acme

4

1 1/2-4acme

4

1 3/4-4acme

4

2-4acme

4

^......

4

6

4