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.
Columbia 
Canada 
Germany Classification: Gaskets,washers & other seals
NSN 6610-01-462-5980
NSN 5975-01-152-8617
NSN 6220-00-489-8571
NSN 5895-01-388-4523
NSN 6135-01-215-1245
NSN 6650-01-304-8132
NSN 6320-00-809-5744
NSN 5999-01-487-5668
NSN 5975-01-420-7869
NSN 6610-00-191-5317
NSN 6220-01-247-4653
NSN 5915-00-678-5300