A circular shaped item with an aperture manufactured to predetermined dimensions and designed for use as a seal in stuffing boxes, packing nuts, and the like. It may be (1) any nonmetallic molded or formed ring (except solid (without joint) rings having a square or rectangular cross section); or (2) any shredded metal or metal foil type metallic or semimetallic rings. Excludes felt items but includes multimaterial items in which one of the materials is felt. For solid (without joints) nonmetallic items with a square or rectangular cross section, see washer (as modified) and gasket. For rubber items specifically designed for weather-proofing doors, windows, chests, and the like see seal, nonmetallic angle; seal, nonmetallic channel; and seal, nonmetallic, special shaped section. For circular (with aperature) nonmetallic items with a solid round cross-section see o-ring. Excludes cup, compression; gasket; washer (as modified); and felt, mechanical, preformed.
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France 
Germany 
Turkey Classification: Gaskets,washers & other seals
NSN 5998-01-104-3878
NSN 5920-01-526-9749
NSN 5998-01-121-4240
NSN 5996-01-258-6550
NSN 4140-00-001-1536
NSN 5925-01-269-1105
NSN 5895-01-269-0223
NSN 5930-00-000-0117
NSN 5935-01-268-6398
NSN 5975-01-267-5875
NSN 5996-01-513-9656
NSN 6130-01-245-1728