2a thread class right-hand 0.177" thread length flat countersunk head style 56 thread quantity per inch passivate screw surface treated unc thread series
Used on f100 eng. 3a thread class right-hand 0.255" thread length square head style 28 thread quantity per inch shoulder is casehardened unf thread series
3a thread class right-hand flush countersunk head style 0.943" grip length 32 thread quantity per inch 95000 single pounds per square inch shear strength passivate surface treated unjc thread series