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 
Portugal Classification: Gaskets,washers & other seals
NSN 5945-01-225-0663
NSN 5960-01-599-9821
NSN 6145-01-143-7243
NSN 5905-01-582-3363
NSN 5925-01-295-3416
NSN 6105-01-069-3966
NSN 6220-00-660-5539
NSN 6105-01-659-2444
NSN 6650-01-072-2508
NSN 5996-01-459-8590
NSN 6645-01-461-7704
NSN 5960-01-512-0233