3a thread class right-hand 0.276" thread length hexagon head style 1.740" grip length 28 thread quantity per inch chromium grip surface treated unjf thread series
3a thread class right-hand 2.250" thread length pan head style 32 thread quantity per inch cadmium or chromate screw surface treated unjc thread series
3a thread class right-hand 0.276" thread length flat countersunk head style 0.178" grip length 32 thread quantity per inch cadmium surface treated unjf thread series