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 5998-01-484-3613
NSN 5950-01-437-9051
NSN 6645-00-763-4852
NSN 5895-01-435-2053
NSN 2925-01-193-6689
NSN 6240-01-029-1113
NSN 5835-00-980-0468
NSN 6135-01-328-0639
NSN 7035-01-085-5955
NSN 5905-01-124-6611
NSN 6620-01-330-8802
NSN 5895-01-340-5356