2a 1st end thread class 18 2nd end thread quantity per inch straight thread connector short wrenching facility 0.6875 inch across the flats B66 flareless w/ center wrenching facility unf 1st end thread series
2a 1st end thread class 20 1st end thread quantity per inch straight thread connector short wrenching facility 0.5625 inch across the flats B66 flareless w/ center wrenching facility unf 1st end thread series
2a 1st end thread class 18 2nd end thread quantity per inch straight thread connector shorts wrenching facility 0.6250 inch across the flats B66 flareless w/ center wrenching facility unf 1st end thread series
2a 1st end thread class 14 1st end thread quantity per inch straight thread connector short wrenching facility 1 inch across the flats B66 flareless w/ center wrenching facility unf 1st end thread series
2a 1st end thread class 12 1st end thread quantity per inch straight thread connector short wrenching facility 1.25 inch across the flats B66 flareless w/ center wrenching facility unf 1st end thread series
2a 1st end thread class 14 1st end thread quantity per inch straight thread connector short wrenching facility 0.6875 inch across the flats B66 flareless w/ center wrenching facility unf 1st end thread series
2a 1st end thread class 14 1st end thread quantity per inch straight thread connector short wrenching facility 1 inch across the flats B66 flareless w/ center wrenching facility unf 1st end thread series