3a thread class right-hand 1.000" thread length chamfer flange head style 18 thread quantity per inch passivate fastener surface treated unc thread series
2a thread class right-hand 1.000" thread length hexagon head style 18 thread quantity per inch hex cap screw chromate surface treated unc thread series
Used on navy codes llhafb110,llh38a002. 3a thread class right-hand 0.500" thread length round extended washer head style 32 thread quantity per inch screw, machine, washer face passivate screw surface treated unjc thread series