Used on c-5 reliability enhancement re-engining program. R3a thread class right-hand 0.250" thread length hexagon extended washer head style R12 thread quantity per inch bolt-attach, aft, inbd & outbd pylon to wing 63 rhr surface roughness on shank exluding base of bolt head anodize surface treated unjf thread series
2a thread class right-hand 0.315" thread length flat fillister head style 1.04" grip length 24 thread quantity per inch screw, clevis groove width is 0.060; slot is 0.125 x 0.125; surface finish is 125 microinches cadmium surface treated unf thread series
Used on c-17 aircraft. receptacle-quarter turn, angle mounting strip item has 90 degree angle with holes 0.242 diameter, 0.280 deep, centers spaced 0.375 in. apart, 0.188 between center to center distance between 74 holes