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.
Canada 
France 
Norway Classification: Gaskets,washers & other seals
NSN 5965-01-570-4711
NSN 6610-00-315-9315
NSN 5905-01-061-7413
NSN 5915-01-142-3713
NSN 5835-01-384-3206
NSN 2925-01-496-1068
NSN 5930-01-219-8799
NSN 5975-00-897-6624
NSN 6105-01-252-8847
NSN 5975-00-343-0370
NSN 5895-01-435-8660
NSN 6320-00-583-3104