Used on rast sytem helicopter landing system; nha: 6534e401. 16 1st end thread quantity per inch male connector nut near middle of connector is 1.060 across flats threaded external rigid, threaded internal swivel unf 2nd end thread series
3a 2nd end thread class 12 2nd end thread quantity per inch material is listed as inconel 625 rigid w/offset wrenching facility unj 2nd end thread series