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.
Brazil 
Spain 
France 
Republic of Korea Classification: Gaskets,washers & other seals
NSN 6110-00-350-6192
NSN 5998-01-463-2811
NSN 6220-01-407-8403
NSN 6240-00-146-9322
NSN 5935-01-170-1910
NSN 5835-01-442-6079
NSN 5915-01-432-0324
NSN 5990-00-591-3793
NSN 7035-00-267-5424
NSN 6110-01-258-4300
NSN 2925-00-504-0913
NSN 5855-00-532-0025