Male Hex Nipple:

Stainless Steel / Carbon Steel

HOSE SIZE 1/4 3/8 1/2 3/4 1 1-1/4 1-1/2 2
A 1.66 1.78 2.13 2.31 2.50 2.53 2.69 2.72
B 1.28 1.28 1.50 1.56 1.75 1.78 1.94 1.97