3a thread class right-hand 0.375" thread length dished hexagon head style 1.688" grip length 28 thread quantity per inch plunger protruding from head 0.075 in. max passivate surface treated unjf thread series
2a thread class right-hand 0.875" thread length flat countersunk head style 16 thread quantity per inch zinc screw surface treated surface treatment 0.0003 in. thick, supplementary chromate treatment to be bronze or olive drab in color unc thread series
3a thread class right-hand 1.440" thread length flat chamfer head style 16 thread quantity per inch surface treatment 0.0003 in. thick, supplementary chromate treatment to be bronze or olive drab in color zinc surface treated unc thread series
3a thread class right-hand 0.403" thread length flat countersunk head style 1.928" grip length 28 thread quantity per inch cadmium surface treated unjf thread series
2a thread class right-hand bevel-conical head style 32 thread quantity per inch nylock fastener corp adds nylon locking pellet to AN520-10-07 screw unf thread series