universal head style 0.626" grip length "ns" letters after the material code "b" indicate no preference to lock type (may be visible or internal) . rivets with no letter code (indicating visible lock type) chromate sleeve surface treated
flush (flat) countersunk (included angle - less than 135 deg w or w/o chamfer) head style 41000 single pounds per square inch shear strength aluminum alloy or chromate surface treated
3a thread class right-hand 0.251" thread length hexagon head style 0.740" grip length 32 thread quantity per inch navy special project unjf thread series
3a thread class right-hand 0.298" thread length dished hexagon head style 0.802" grip length 32 thread quantity per inch passivate surface treated unjf thread series
3a thread class right-hand 0.298" thread length dished hexagon head style 1.615" grip length 32 thread quantity per inch cadmium surface treated unjf thread series
3a thread class right-hand 0.553" thread length dished hexagon head style 1.615" grip length 24 thread quantity per inch cadmium surface treated unjf thread series
3a thread class right-hand 0.572" thread length flat countersunk head style 32 thread quantity per inch passivate screw surface treated unf thread series
