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 5998-01-181-5312
NSN 6145-01-604-3295
NSN 5945-00-115-8144
NSN 5975-01-373-6399
NSN 5915-00-454-7746
NSN 6110-00-709-2720
NSN 6320-01-562-1599
NSN 6320-00-004-9158
NSN 6220-01-117-7619
NSN 5996-00-086-9352
NSN 5965-01-537-5562
NSN 5930-01-252-0456