3a thread class right-hand 0.250" thread length pan head style 32 thread quantity per inch chromate stand-off or anodize stand-offpassivate fastener surface treated unc thread series
2a thread class right-hand 0.220" thread length flat chamfer head style 32 thread quantity per inch passivate fastener surface treated unc thread series
3a thread class right-hand 0.735" thread length dished hexagon head style 0.802" grip length 20 thread quantity per inch passivate surface treated unjf thread series