2a thread class right-hand 0.471" thread length flat countersunk head style 24 thread quantity per inch dichromate zinc screw surface treated unf thread series
3a thread class right-hand 0.214" thread length flat countersunk head style 32 thread quantity per inch cadmium screw surface treated unjc thread series
3a thread class right-hand 0.359" thread length flat chamfer head style 32 thread quantity per inch cadmium fastener surface treated unrf thread series