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 5915-00-644-0356
NSN 5998-01-327-8406
NSN 5960-00-258-9292
NSN 5960-01-262-0354
NSN 6620-01-290-2973
NSN 6650-01-145-5173
NSN 4140-00-391-0879
NSN 5999-01-481-4510
NSN 6650-01-257-3114
NSN 5930-00-343-6755
NSN 6150-00-370-1356
NSN 5910-00-906-3470