3a thread class right-hand 0.400" thread length undercut hexagon head style 0.302" grip length 28 thread quantity per inch plastic polyamide patch-type element on threads cadmium surface treated unjf thread series
3a thread class right-hand 2.330" thread length hexagon head style 0.070" hole diameter 28 thread quantity per inch passivate surface treated unjf thread series
flush (flat) countersunk (included angle - less than 135 deg w or w/o chamfer) head style 49000 single pounds per square inch shear strength cadmium surface treated