Thread class can also be 3a
An item specifically designed to fit over the opening(s) of various items to provide mechanical protection and/or to prevent the entrance of foreign matter during painting, shipping, storage, or the like. It is not designed to retain fluids under pressure during equipment operation. Excludes cover, electrical connector; hood, sealing, bottle; and stopper, bottle. For items designed to fit into or over the opening(s) of various items, see cap-plug, protective, dust and moisture seal.
Classification: Gaskets,washers & other seals
NSN 4140-01-444-8866
NSN 5998-01-610-5514
NSN 6240-01-623-8783
NSN 6685-00-981-1763
NSN 5999-01-601-5495
NSN 5930-01-237-3487
NSN 7035-00-500-7839
NSN 5960-00-525-1898
NSN 5999-01-103-4610
NSN 5895-01-069-9670
NSN 5915-01-447-0872
NSN 6150-00-406-5883