2a thread class right-hand 0.542" thread length watertight head style 24 thread quantity per inch passivate screw surface treated o-ring material: silicone rubber, comp a per mil-s-82496 unc thread series
3a thread class right-hand 0.071" thread length double hexagon w/hole head style 28 thread quantity per inch 32 surface finish on bearing surface of head, grip, cadmium surface treated unjf thread series
Used on t-38 acft. flush (flat) countersunk (included angle - less than 135 deg w or w/o chamfer) head style 0.782" grip length original name: fastener cadmium bolt surface treated
2a thread class right-hand 0.940" thread length oval head style 16 thread quantity per inch 1 shoulder 0.573 in dia loc bet ext rel dia passivate surface treated unc thread series
3a thread class right-hand 0.425" thread length dished hexagon head style 0.865" grip length 28 thread quantity per inch aluminum surface treated unjf thread series
