3a 2nd end thread class 12 2nd end thread quantity per inch 2nd end bulkhead, 1.062-12 in. unj, cl 3a passivate surface treated unj 2nd end thread series
Used on aircraft, hornet f/a-18. 3a all ends thread class 20 1st end thread quantity per inch weapon system essential lubricant dry film body surface treated unjef 2nd end thread series