2a thread class right-hand 0.812" thread length hexagon head style 0.938" grip length 20 thread quantity per inch cadmium surface treated unf thread series
2a thread class right-hand 0.406" thread length knurled no. 4 head style 32 thread quantity per inch navy special project passivate surface treated unf thread series
3a thread class right-hand 0.313" thread length pan no. 2 head style 20 thread quantity per inch thd relieved groove cadmium surface treated unc thread series