NPT Male thread

DN(inch)           THREAD(inch)

3/16                  1/4"NPT

1/4                    1/4 NPT

5/16                  1/4 NPT

1/4                    3/8 NPT

5/16                  3/8 NPT

3/8                    3/8 NPT

3/8                   1/2 NPT

1/2                   1/2 NPT

5/8                  1/2 NPT

1/2                  3/4 NPT

5/8                  3/4 NPT

3/4                  3/4 NPT

3/4                  1 NPT

1                     1 NPT

1                     1 1 /4 NPT

1 1/4               1 1/4 NPT

1 1/4               1 1/2 NPT

1 1/2               1 1/2 NPT

2                     2 NPT

1/4                   3/8 NPT