3a thread class right-hand 0.425" thread length dished hexagon head style 0.802" grip length 28 thread quantity per inch bolt, hex head, close tolerance, A286 cres, long threads, self-locking cadmium surface treated unjf thread series
3a thread class right-hand 0.475" thread length bevel-conical head style 0.046" hole diameter 28 thread quantity per inch threads have been rolled after heat treat cadmium surface treated unf thread series