3a thread class right-hand 0.453" thread length flat countersunk head style 0.990" grip length 20 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 0.545" grip length a-286 cres, passivated locking ring chromate sleeve surface treated
3a thread class right-hand 0.150" thread length modified pan head style 32 thread quantity per inch altered item passivate surface treated unc thread series