2a thread class right-hand 0.313" thread length watertight head style 32 thread quantity per inch navy special project passivate screw surface treated furnished with one silicone rubber o ring unc thread series
3a thread class right-hand 0.624" thread length flat countersunk head style 1.490" grip length 20 thread quantity per inch passivate surface treated unjf thread series
3a thread class right-hand 0.922" thread length 9.594" grip length 14 thread quantity per inch special designed head, 3/4 in. thick, portion of head machined to fit contour of connecting rod unf thread series
3a thread class right-hand 0.481" thread length double hexagon head style 0.875" grip length 24 thread quantity per inch navy special project cadmium surface treated unjf thread series
flush (flat) countersunk (included angle - less than 135 deg w or w/o chamfer) head style 33000 single pounds per square inch shear strength anodize or chromate surface treated
3a thread class right-hand 0.370" thread length fillister head style 28 thread quantity per inch recessed head, oxide color black passivate or oxide surface treated unf thread series
Used on cobra helicopter. right-hand 0.375" thread length headless (setscrew) head style 40 thread quantity per inch passivate surface treated uns thread series
