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.
Dept. of the Air Force 
Dept. of the Navy 
Poland 
Spain 
Italy Classification: Gaskets,washers & other seals
NSN 5835-00-003-0295
NSN 5935-01-634-0668
NSN 7035-01-466-5636
NSN 6240-01-253-0687
NSN 5855-01-228-0942
NSN 6110-01-076-4060
NSN 5975-00-020-8827
NSN 5985-01-119-5570
NSN 5960-01-599-9821
NSN 7035-01-174-7716
NSN 6110-01-120-5278
NSN 6240-01-466-9112