universal head style 0.063" 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 0.388" thread length flat chamfer head style 20 thread quantity per inch solid film lubricant mil-l-46010 o/a; groove under head 0.281 in. dia, 0.031 in. w; thd relief passivate surface treated unc thread series
3a thread class right-hand 0.515" thread length dished hexagon head style 5.865" grip length 18 thread quantity per inch cadmium surface treated unjf thread series
3a thread class right-hand 0.710" thread length dished hexagon head style 1.115" grip length 20 thread quantity per inch cadmium surface treated unjf thread series
3a thread class left-hand 1.750" thread length 1.750" overall length 24 thread quantity per inch three drilled holes in the shoulder width 0.045 in. min 0.050 in. max D1a of each hole passivate surface treated shouldered unjf thread series
