Used on tank,full tracked,xm1;tank,full tracked,m1w/improved armor;tank,full tracked,m1a1. 2a thread class right-hand 0.790" thread length hexagon head style 16 thread quantity per inch unc thread series
3a thread class right-hand 0.443" thread length flat countersunk head style 0.614" grip length 28 thread quantity per inch cadmium surface treated unjf thread series
flush (flat) countersunk (included angle - less than 135 deg w or w/o chamfer) head style 0.344" grip length 112000 single pounds per square inch shear strength cadmium sleeve surface treated
3a thread class right-hand 0.252" thread length pan head style 32 thread quantity per inch navy special project cadmium screw surface treated unjc thread series
3a thread class right-hand 0.371" thread length flat countersunk head style 32 thread quantity per inch passivate screw surface treated unf thread series
3a thread class right-hand 0.594" thread length flat chamfer head style 40 thread quantity per inch head vertically knurled anodize head surface treated unc thread series
3a thread class right-hand 0.305" thread length crowned hexagon head style 1.688" grip length 24 thread quantity per inch passivate surface treated unjf thread series
2a thread class right-hand 0.380" thread length knurled no. 4 head style 28 thread quantity per inch passivate fastener surface treated unf thread series
3a thread class right-hand 0.287" thread length fillister countersunk head style 0.490" grip length 32 thread quantity per inch passivate surface treated unjf thread series
3a thread class right-hand 0.251" thread length pan head style 0.615" grip length 32 thread quantity per inch passivate surface treated unjf thread series