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.
France 
Germany 
Turkey Classification: Gaskets,washers & other seals
NSN 6320-00-116-3658
NSN 5975-00-960-5879
NSN 4140-00-864-1710
NSN 6620-01-511-5352
NSN 4140-01-478-3897
NSN 6145-00-826-2932
NSN 6650-00-879-5834
NSN 5985-01-386-6490
NSN 6620-00-410-8935
NSN 5985-01-634-0635
NSN 6105-00-779-0769
NSN 5990-01-139-6042