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 
Netherlands 
Italy Classification: Gaskets,washers & other seals
NSN 6145-01-442-3511
NSN 5998-01-306-9582
NSN 5965-01-624-2251
NSN 6220-00-078-2727
NSN 5965-01-068-2714
NSN 6685-01-516-8396
NSN 5925-01-167-0812
NSN 5915-00-087-7920
NSN 6650-01-548-7915
NSN 5950-00-763-0507
NSN 6610-01-384-7949
NSN 6240-00-771-2263