3a thread class right-hand 0.313" thread length oval countersunk head style 0.240" grip length 32 thread quantity per inch internal drive ribbed unjf thread series
3a thread class right-hand 0.378" thread length flat countersunk head style 0.177" grip length 28 thread quantity per inch internal drive ribbed unjf thread series
2a thread class right-hand 0.780" thread length flat chamfer head style 18 thread quantity per inch color black; straight knurl oxide surface treated unc thread series
3a thread class right-hand 0.923" thread length hexagon head style 3.922" grip length 18 thread quantity per inch passivate surface treated unf thread series