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 5996-00-246-8295
NSN 5998-00-794-3818
NSN 4140-01-462-0268
NSN 6240-00-150-6754
NSN 5996-01-111-8580
NSN 5920-01-605-4077
NSN 7035-01-482-9941
NSN 5915-00-171-1812
NSN 7035-00-922-5700
NSN 7035-00-803-3056
NSN 5945-01-122-0150
NSN 6105-00-619-3377