universal head style 0.376" 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
2a thread class right-hand 0.590" thread length flat chamfer head style 32 thread quantity per inch machine sides 0.300 in. from head, to 0.039 in. passivate surface treated unc thread series
3a thread class right-hand 0.602" thread length hexagon head style 4.985" grip length 24 thread quantity per inch passivate surface treated unjf thread series
