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 5990-01-241-9472
NSN 5915-01-441-5444
NSN 6685-01-572-6305
NSN 4140-00-632-1332
NSN 6610-01-591-1117
NSN 7035-01-113-1424
NSN 6610-01-469-2408
NSN 5935-00-420-7423
NSN 5835-01-571-4083
NSN 5895-00-883-9669
NSN 6130-00-402-0559
NSN 6320-01-607-1491