3a all ends thread class 12 all ends thread quantity per inch flange near center 3.400 in. dia 0.100 in. thk one side square 1.500 in. from center of flange cadmium surface treated center wrenching facility unj all ends thread series
3a 1st end thread class 12 1st end thread quantity per inch machined groove in flared end to accommodate seal ring per KC103 passivate outside surface treated npt 2nd end thread series