AC0.250 thread class right-hand 0.250" thread length flat chamfer head style 48 thread quantity per inch passivate screw surface treated unrc thread series
2a thread class right-hand 1.060" thread length hexagon head style 18 thread quantity per inch drilled hole on flat portion of head 0.064 - .070 in dia cadmium surface treated unc thread series
3a thread class right-hand 0.376" thread length flat countersunk head style 32 thread quantity per inch cadmium screw surface treated unjf thread series