universal head style 0.563" 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
3a thread class right-hand 0.688" thread length flat chamfer head style 32 thread quantity per inch passivate fastener surface treated unrc thread series
3a thread class right-hand 0.688" thread length flat chamfer head style 32 thread quantity per inch passivate fastener surface treated unrc thread series
3a thread class right-hand 0.953" thread length hexagon head style 0.070" hole diameter 5.438" grip length 18 thread quantity per inch unf thread series
3a thread class right-hand 0.740" thread length double hexagon extended washer head style 2.190" grip length 28 thread quantity per inch unjf thread series
