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.
Belgium 
Canada 
Netherlands Classification: Gaskets,washers & other seals
NSN 6150-00-005-6550
NSN 5905-01-367-1693
NSN 4140-00-580-8508
NSN 5998-01-200-0128
NSN 5965-01-472-7092
NSN 5950-01-258-4994
NSN 5975-01-232-0100
NSN 6130-00-876-2511
NSN 5960-01-442-6234
NSN 5975-01-200-9320
NSN 6650-01-509-8018
NSN 6220-00-305-0801