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 
Singapore 
Australia 
France 
Denmark Classification: Gaskets,washers & other seals
NSN 6650-01-226-2397
NSN 5960-01-269-5704
NSN 6130-00-279-9769
NSN 6685-00-005-1288
NSN 5975-01-528-9565
NSN 5998-01-304-2309
NSN 5925-01-282-8991
NSN 6145-01-070-0579
NSN 6620-01-048-4145
NSN 6650-01-540-4402
NSN 5915-00-269-4463
NSN 2925-00-099-4030