UNC thread plug gauge American standard UNF plug gage
unc |
unf |
unef |
||||||
nominal size |
thread/perinch |
accuracy |
nominal size |
thread/perinch |
accuracy |
nominal size |
thread/perinch |
accuracy |
3 | 48 | 2A,3B | 3 | 56 | 2A,3B | 12 | 32 | 2A,3B |
4 | 40 | 2A,3B | 4 | 48 | 2A,3B | 1/4 | 32 | 2A,3B |
5 | 40 | 2A,3B | 5 | 44 | 2A,3B | 5/16 | 32 | 2A,3B |
6 | 32 | 2A,3B | 6 | 40 | 2A,3B | 3/8 | 32 | 2A,3B |
8 | 32 | 2A,3B | 8 | 36 | 2A,3B | 7/16 | 28 | 2A,3B |
10 | 24 | 2A,3B | 10 | 32 | 2A,3B | 1/2 | 28 | 2A,3B |
12 | 24 | 2A,3B | 12 | 28 | 2A,3B | 9/16 | 24 | 2A,3B |
1/4 | 20 | 2A,3B | 1/4 | 24 | 2A,3B | 5/8 | 24 | 2A,3B |
5/16 | 18 | 2A,3B | 5/16 | 24 | 2A,3B | 11/16 | 24 | 2A,3B |
3/8 | 16 | 2A,3B | 3/8 | 20 | 2A,3B | 3/4 | 20 | 2A,3B |
7/16 | 14 | 2A,3B | 7/16 | 20 | 2A,3B | 7/8 | 20 | 2A,3B |
1/2 | 13 | 2A,3B | 1/2 | 18 | 2A,3B | 13/16 | 20 | 2A,3B |
9/16 | 12 | 2A,3B | 9/16 | 18 | 2A,3B | 15/16 | 20 | 2A,3B |
5/8 | 11 | 2A,3B | 5/8 | 16 | 2A,3B | 1 | 20 | 2A,3B |
3/4 | 10 | 2A,3B | 3/4 | 14 | 2A,3B | 1 1/16 | 18 | 2A,3B |
7/8 | 9 | 2A,3B | 7/8 | 12 | 2A,3B | 1 1/8 | 18 | 2A,3B |
1 | 8 | 2A,3B | 1 | 12 | 2A,3B | 1 3/16 | 18 | 2A,3B |
1 1/8 | 7 | 2A,3B | 1 1/8 | 12 | 2A,3B | 1 1/4 | 18 | 2A,3B |
1 1/4 | 7 | 2A,3B | 1 1/4 | 12 | 2A,3B | 1 5/16 | 18 | 2A,3B |
1 3/8 | 6 | 2A,3B | 1 3/8 | 12 | 2A,3B | 1 3/8 | 18 | 2A,3B |
1 1/2 | 6 | 2A,3B | 1 1/2 | 12 | 2A,3B | 1 7/16 | 18 | 2A,3B |
1 3/4 | 5 | 2A,3B | 1 3/4 | 12 | 2A,3B | 1 1/2 | 18 | 2A,3B |
2 | 4.5 | 2A,3B | 2 | 12 | 2A,3B | 1 9/16 | 18 | 2A,3B |
…… | …… | …… | ||||||
6 | 6 | 6 |
nominal size |
thread/perinch |
accuracy |
nominal size |
thread/perinch |
accuracy |
nominal size |
thread/perinch |
accuracy |
nominal size |
thread/perinch |
accuracy |
5/16 | 20 | 2A,3B | 7/8 | 32 | 2A,3B | 1 5/16 | 20 | 2A,3B | 1 11/16 | 12 | 2A,3B |
5/16 | 28 | 2A,3B | 15/16 | 12 | 2A,3B | 1 5/16 | 28 | 2A,3B | 1 11/16 | 16 | 2A,3B |
3/8 | 20 | 2A,3B | 15/16 | 16 | 2A,3B | 1 3/8 | 8 | 2A,3B | 1 11/16 | 20 | 2A,3B |
3/8 | 28 | 2A,3B | 15/16 | 28 | 2A,3B | 1 3/8 | 16 | 2A,3B | 1 3/4 | 6 | 2A,3B |
7/16 | 32 | 2a、3a | 15/16 | 32 | 2A,3B | 1 3/8 | 20 | 2A,3B | 1 3/4 | 8 | 2A,3B |
1/2 | 16 | 2A,3B | 1 | 16 | 2A,3B | 1 3/8 | 28 | 2A,3B | 1 3/4 | 12 | 2A,3B |
9/16 | 16 | 2A,3B | 1 | 28 | 2A,3B | 1 7/16 | 6 | 2A,3B | 1 3/4 | 16 | 2A,3B |
9/16 | 20 | 2A,3B | 1 1/16 | 8 | 2A,3B | 1 7/16 | 8 | 2A,3B | 1 3/4 | 20 | 2A,3B |
9/16 | 32 | 2A,3B | 1 1/16 | 12 | 2A,3B | 1 7/16 | 12 | 2A,3B | 1 13/16 | 6 | 2A,3B |
5/8 | 12 | 2A,3B | 1 1/16 | 16 | 2A,3B | 1 7/16 | 16 | 2A,3B | 1 13/16 | 8 | 2A,3B |
5/8 | 16 | 2A,3B | 1 1/16 | 20 | 2A,3B | 1 7/16 | 20 | 2A,3B | 1 13/16 | 12 | 2A,3B |
5/8 | 20 | 2A,3B | 1 1/16 | 28 | 2A,3B | 1 7/16 | 28 | 2A,3B | 1 13/16 | 16 | 2A,3B |
5/8 | 28 | 2A,3B | 1 1/8 | 8 | 2A,3B | 1 1/2 | 8 | 2A,3B | 1 13/16 | 20 | 2A,3B |
11/16 | 12 | 2A,3B | 1 1/8 | 16 | 2A,3B | 1 1/2 | 16 | 2A,3B | 1 7/8 | 6 | 2A,3B |
11/16 | 16 | 2A,3B | 1 1/8 | 20 | 2A,3B | 1 1/2 | 20 | 2A,3B | 1 7/8 | 8 | 2A,3B |
11/16 | 20 | 2A,3B | 1 1/8 | 28 | 2A,3B | 1 1/2 | 28 | 2A,3B | 1 7/8 | 12 | 2A,3B |
11/16 | 28 | 2A,3B | 1 3/16 | 8 | 2A,3B | 1 9/16 | 6 | 2A,3B | 1 7/8 | 16 | 2A,3B |
3/4 | 12 | 2A,3B | 1 3/16 | 12 | 2A,3B | 1 9/16 | 8 | 2A,3B | 1 7/8 | 20 | 2A,3B |
3/4 | 28 | 2A,3B | 1 3/16 | 16 | 2A,3B | 1 9/16 | 12 | 2A,3B | 1 15/16 | 6 | 2A,3B |
3/4 | 32 | 2A,3B | 1 3/16 | 20 | 2A,3B | 1 9/16 | 16 | 2A,3B | 1 15/16 | 8 | 2A,3B |
13/16 | 12 | 2A,3B | 1 3/16 | 28 | 2A,3B | 1 9/16 | 20 | 2A,3B | 1 15/16 | 12 | 2A,3B |
13/16 | 16 | 2A,3B | 1 1/4 | 8 | 2A,3B | 1 5/8 | 6 | 2A,3B | 1 15/16 | 16 | 2A,3B |
13/16 | 28 | 2A,3B | 1 1/4 | 16 | 2A,3B | 1 5/8 | 8 | 2A,3B | 1 15/16 | 20 | 2A,3B |
13/16 | 32 | 2A,3B | 1 1/4 | 20 | 2A,3B | 1 5/8 | 12 | 2A,3B | 2 | 6 | 2A,3B |
7/8 | 12 | 2A,3B | 1 1/4 | 28 | 2A,3B | 1 5/8 | 16 | 2A,3B | 2 | 8 | 2A,3B |
7/8 | 16 | 2A,3B | 1 5/16 | 8 | 2A,3B | 1 5/8 | 20 | 2A,3B | …… | ||
7/8 | 28 | 2A,3B | 1 5/16 | 16 | 2A,3B | 1 11/16 | 6 | 2A,3B | 6 | …… |