2a 1st end thread class ist end bulkhead thd size 0.438 in. nom, cl 2a, unf.; supports anthony model mlt 6-2; nsn 3930003271575 passivate surface treated unf 1st end thread series
Used on airplane, reconnaissance, utility, ru-21. 3a 3rd end bulkhead thread class 12 3rd end bulkhead thread quantity per inch anodize surface treated unj 3rd end bulkhead thread series
3a 2nd end thread class 12 1st end thread quantity per inch first end bulkhead, unj, 1.312 in. thd size, 3a class anodize surface treated unj 1st end thread series