2a all ends thread class 12 1st end thread quantity per inch fluoroelastomer packing preformed; supports grumman a-10 aircraft un 1st end thread series
Used on aircraft, harrier av-8b. 3a all ends thread class 20 1st end thread quantity per inch drilled for 2 safety wire holes on wrenching facility 180 deg apart, 0.070 in. dia; weapon system essential unjf 2nd end thread series
3a 1st end thread class 12 1st end thread quantity per inch flange in center 1.625 in. dia; u/o f-16 acft passivate surface treated unj 1st end thread series