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 5935-00-156-1182
NSN 5975-00-782-5586
NSN 5920-00-142-9993
NSN 6240-01-284-6482
NSN 5915-01-160-1861
NSN 5996-01-341-8499
NSN 5910-01-298-1796
NSN 5920-01-647-1273
NSN 6240-00-421-1862
NSN 5925-01-350-4295
NSN 6610-00-129-9119
NSN 6135-01-299-7252