Used on himars, rsv, mk 37, 2320-01504-5218. 2a 2nd end thread class swivel nut elbow nha is cylinder tube group, p/n 499-4701; hex across the flats is 0.875 inch cadmium surface treated unf 2nd end thread series
Used on V-22. fitting assembly, elbow 90 deg, reducer threads per inch on tube size .500 is .7500-16 unjf, on the tube size .625 is .8750-14 unjf cadmium surface treated