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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Australia 
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Republic of Korea 
United Kingdom Classification: Gaskets,washers & other seals
NSN 5975-01-485-7961
NSN 6220-01-079-0284
NSN 6650-01-495-1058
NSN 5945-01-399-0608
NSN 4140-01-578-7482
NSN 6145-00-753-2264
NSN 6105-01-112-2308
NSN 5950-01-308-6485
NSN 6105-01-261-8028
NSN 5985-01-139-4667
NSN 5975-01-649-4461
NSN 5998-00-182-1421