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 6610-00-441-0523
NSN 6145-01-609-8830
NSN 6105-01-116-6428
NSN 6685-01-435-3625
NSN 5910-01-435-4562
NSN 6685-00-218-1229
NSN 6320-01-134-7267
NSN 5920-01-123-5212
NSN 5975-01-486-1706
NSN 6685-00-119-6262
NSN 6610-00-516-4228
NSN 6105-01-594-2251