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 5996-01-202-8127
NSN 6105-01-283-1655
NSN 5945-01-381-6300
NSN 5960-01-137-2329
NSN 5998-00-815-7802
NSN 5950-00-142-9031
NSN 6150-01-244-1204
NSN 5905-00-864-2281
NSN 5910-01-112-0723
NSN 4140-01-432-4027
NSN 6610-01-248-4339
NSN 6650-01-321-8823