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.
Columbia 
Canada 
Germany Classification: Gaskets,washers & other seals
NSN 6135-00-488-4478
NSN 6650-00-820-4577
NSN 5910-01-605-3393
NSN 6320-00-174-1362
NSN 4140-00-063-6417
NSN 6320-01-445-5893
NSN 6110-01-242-1617
NSN 6130-01-492-6148
NSN 5960-01-649-1341
NSN 5905-01-520-5396
NSN 5999-01-470-0372
NSN 6685-00-606-8178