Double hexagonal JIC 37 Swivel female

DN(inch)       THREAD(inch)

1/4               7/16-20 UNF

1/4               1/2-20 UNF

5/16              9/16-18 UNF

1/2                3/4-16 UNF

3/4                1 1/16-12 UNF

1                    1 5/16-12 UNF