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.
Columbia 
Canada 
Germany Classification: Gaskets,washers & other seals
NSN 6150-01-546-7911
NSN 5895-00-589-2983
NSN 6320-01-176-8367
NSN 5945-01-246-7616
NSN 6150-01-067-8226
NSN 5895-01-164-8920
NSN 5910-00-554-1422
NSN 5996-01-472-5049
NSN 5985-01-588-9860
NSN 6320-01-411-7456
NSN 5975-01-431-0921
NSN 6150-01-076-4811