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.
National Aeronautics and Space Administration 
Spain 
Kuwait 
Canada 
France 
Germany Classification: Gaskets,washers & other seals
NSN 5999-01-010-0789
NSN 5990-01-510-4699
NSN 5965-00-104-3121
NSN 6220-00-514-3005
NSN 5930-01-616-3528
NSN 5985-01-043-0785
NSN 5920-01-087-6073
NSN 5999-01-061-9771
NSN 6105-00-054-3883
NSN 7035-01-411-2900
NSN 5925-01-631-4207
NSN 6685-00-478-1597