2a thread class right-hand 1.063" thread length hexagon head style 6.500" grip length 13 thread quantity per inch cadmium surface treated unc thread series
3a thread class right-hand 1.012" thread length hexagon head style 1.360" grip length 18 thread quantity per inch passivate surface treated unf thread series
3a thread class right-hand 0.343" thread length double hexagon head style 1.250" grip length 24 thread quantity per inch nickel surface treated unjf thread series
3a thread class right-hand 0.423" thread length flat countersunk head style 1.302" grip length 24 thread quantity per inch bearing surface of head grooved to 0.394 in. min, 0.396 in. max dia, 0.092 in. min, 0.097 in. max lg, from top of head unf thread series
3a thread class right-hand 0.859" thread length flat chamfer head style 16 thread quantity per inch passivate fastener surface treated unc thread series
2a nut thread a thread class right-hand nut thread a 0.880" nut thread a thread length 16.500" overall length 24 nut thread a thread quantity per inch unf nut thread a thread series