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 6610-01-324-7017
NSN 5925-01-200-6283
NSN 6240-01-297-2978
NSN 6145-00-336-1986
NSN 6105-00-087-4813
NSN 5996-01-521-3234
NSN 5975-00-269-4365
NSN 5985-01-562-6164
NSN 5915-00-715-2350
NSN 5990-01-608-3505
NSN 5855-01-624-7115
NSN 6620-01-474-4951