universal head style 0.126" 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 0.710" thread length dished hexagon head style 0.678" grip length 20 thread quantity per inch cadmium surface treated unjf thread series
mil std MS21209-F1 is referenced for item description of this part except for coils; 4 1/2 no. of free coils; 2 1/4 no. of coils from end of insert to center of grip coil; item used on mt, 40mm, lchr (M5 subsys rep) fdr. delink mau-56/a coil
3b thread class 28 thread quantity per inch unthreaded tapered bottom 0.220" included in length, two locking keys on top portion grooved keylock unjf thread series
