2a thread class right-hand 2.312" thread length hexagon head style 5 thread quantity per inch shoulder tapers down from head bearing surface at rate of 0.125 in. dia per foot unc thread series
2a thread class right-hand 0.188" thread length flat chamfer head style 56 thread quantity per inch navy special project passivate surface treated unc thread series
3a thread class right-hand 0.401" thread length hexagon head style 0.070" hole diameter 0.079" grip length 28 thread quantity per inch unjf thread series
3a thread class right-hand 0.251" thread length dished hexagon head style 2.990" grip length 32 thread quantity per inch cadmium surface treated unjf thread series
3a thread class right-hand 0.380" thread length flat countersunk head style 0.552" grip length 32 thread quantity per inch passivate surface treated unf thread series
3a thread class right-hand 0.782" thread length pan head style 32 thread quantity per inch navy special project cadmium surface treated unjf thread series
3a thread class right-hand 0.493" thread length flat chamfer head style 0.047" hole diameter 28 thread quantity per inch passivate surface treated unf thread series
