3a thread class right-hand 0.563" thread length hexagon head style 0.062" hole diameter 16 thread quantity per inch navy special project unc thread series
2a thread class right-hand 1.000" thread length hexagon head style 0.062" hole diameter 13 thread quantity per inch zinc surface treated unc thread series
3a thread class right-hand 0.547" thread length hexagon head style 0.245" grip length 28 thread quantity per inch cadmium surface treated unf thread series
3a thread class right-hand 0.410" thread length hexagon head style 0.810" grip length 28 thread quantity per inch cadmium or zinc surface treated unf thread series
2a thread class right-hand 1.125" thread length hexagon head style 4.875" grip length 16 thread quantity per inch cadmium surface treated unf thread series
3a thread class right-hand 0.250" thread length square extended washer head style 28 thread quantity per inch unthreaded portion of shank 0.244 to 0.250 in. dia unf thread series
2a thread class right-hand 0.475" thread length square extended washer head style 0.062" hole diameter 32 thread quantity per inch unthreaded portion of shank 0.185 in. min 0.190 in.mas diameter unf thread series