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.
Spain 
France 
Republic of Korea Classification: Gaskets,washers & other seals
NSN 6650-00-905-9317
NSN 6135-00-519-1325
NSN 5915-00-136-7086
NSN 6650-01-506-5636
NSN 6685-01-012-6449
NSN 5975-01-290-9719
NSN 5945-01-435-0155
NSN 6645-01-400-2119
NSN 5965-00-347-0231
NSN 6645-00-900-5830
NSN 5895-01-430-7181
NSN 6110-01-571-0213