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 5935-00-149-1485
NSN 5985-01-501-4446
NSN 6320-00-882-7061
NSN 7035-00-991-6877
NSN 6150-01-557-3263
NSN 5835-01-540-4995
NSN 7035-01-132-4034
NSN 6650-01-365-7661
NSN 5915-00-011-8348
NSN 6135-01-275-9767
NSN 6220-01-286-2292
NSN 5920-00-144-8031