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 6130-01-252-8351
NSN 6610-01-181-4398
NSN 5985-01-484-0971
NSN 6685-00-155-4301
NSN 5920-00-811-4405
NSN 6650-00-246-3751
NSN 5920-01-513-1997
NSN 5999-00-625-9184
NSN 5975-01-644-1125
NSN 5935-00-235-4801
NSN 5999-01-397-4235
NSN 6240-01-579-6694