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 5910-01-063-7958
NSN 6620-01-491-1434
NSN 5945-01-032-3575
NSN 5990-01-419-0661
NSN 6620-00-280-2874
NSN 6110-01-470-6719
NSN 5835-01-381-2683
NSN 5930-01-444-1835
NSN 2925-01-625-6841
NSN 5999-01-490-5835
NSN 7035-01-411-6062
NSN 7035-00-064-7008