3a thread class right-hand 2.000" thread length flat chamfer head style 16 thread quantity per inch passivate fastener surface treated unrf thread series
3a thread class right-hand 0.735" thread length dished hexagon head style 2.490" grip length 20 thread quantity per inch cadmium surface treated unjf thread series
3b thread class right-hand 1.250" thread length 14 thread quantity per inch material is alloy steel grade 4140, mil-s-5626 or grade 8740, ams 6322; cadmium plated in accordance with qq-p-416, type ii, class 3 keylock unjf thread series