3a all ends thread class first end bulkhead, unjf, 0.438 in. thd size, 3a class passivate surface treated single joint, elbow design unjf 1st end thread series
3a 2nd end bulkhead thread class polytetrafluoroethylene coat on permaswage ends on id only 0.190 in. min 0.240 in. max passivate outside surface treated unjf 2nd end bulkhead thread series
3a 2nd end thread class 12 2nd end thread quantity per inch 2nd end bulkhead thd 1.062-12 in., cl 3a, unj passivate surface treated unj 2nd end thread series
2b all ends thread class 18 all ends thread quantity per inch cadmium nut or zinc nut surface treated rigid, long center wrenching facility uns all ends thread series
