3a 2nd end thread class 12 1st end thread quantity per inch KC134C32; hexagon wrenching flats drilled or non-drilled for lockwire passivate surface treated un 1st end thread series
3a 2nd end thread class 12 1st end thread quantity per inch KC135C28-32; hexagon wrenching flats drilled or non-drilled for lockwire passivate surface treated un 1st end thread series
3a 1st end thread class 20 2nd end thread quantity per inch two 0.070 in. dia safety wire holes on wrenching facility 180 deg apart unjf 2nd end thread series