3a thread class right-hand 0.578" thread length dished hexagon head style 2.990" grip length 24 thread quantity per inch cadmium surface treated unjf thread series
3a thread class right-hand 0.313" thread length flat countersunk head style 0.740" grip length 32 thread quantity per inch passivate surface treated unjc thread series
Used on special size valve assembly. 3a thread class right-hand 1.750" thread length flat chamfer head style 18 thread quantity per inch screw, cap, socket head oxide surface treated unrf thread series