6760-01-060-4683 (57221)
6760-01-060-4683 is equivalent to manufacture part number 57221. It is a aperture assembly and is classified under Federal Supply Class 6760 (6760 - Photographic Accessories), stocked for defense, aerospace, MRO, and industrial maintenance applications. This item is cataloged in the NATO supply system under 6760 - Photographic Accessories and is available through NSN-PARTS for U.S. government MRO, and commercial procurement.