flush (flat) countersunk (included angle - less than 135 deg w or w/o chamfer) head style 0.040" grip length 70 single pounds per square inch shear strength chromate sleeve surface treated
3a thread class right-hand 0.266" thread length double hexagon head style 1.428" grip length 28 thread quantity per inch cadmium surface treated unjf thread series
3a thread class right-hand 0.538" thread length 0.037" hole diameter 24 thread quantity per inch with pellet type element in threads for locking feature cadmium surface treated unf thread series
2a thread class right-hand 2.000" thread length hexagon head style 4.812" grip length 10 thread quantity per inch passivate surface treated unc thread series
3a nut thread a thread class right-hand nut thread a 1.250" nut thread a thread length 12.370" overall length 28 nut thread a thread quantity per inch phosphate surface treated unf nut thread a thread series
2a thread class right-hand 0.375" thread length flat chamfer head style 20 thread quantity per inch head vertically knurled passivate fastener surface treated unc thread series