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.
Brazil 
Spain 
France 
Republic of Korea Classification: Gaskets,washers & other seals
NSN 6650-01-270-6669
NSN 5910-00-814-5866
NSN 5965-01-580-5297
NSN 6220-01-534-3965
NSN 5905-01-482-1779
NSN 5965-01-138-4979
NSN 5990-00-009-3291
NSN 5855-00-149-0766
NSN 6610-00-147-1016
NSN 6145-01-167-8366
NSN 6135-01-364-0667
NSN 6145-00-162-7922