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 6610-01-601-7648
NSN 5915-01-258-4911
NSN 5998-01-314-4902
NSN 5999-01-421-2367
NSN 6105-00-914-7603
NSN 6110-00-232-5092
NSN 5925-01-352-0657
NSN 5999-01-360-9458
NSN 5895-00-477-7455
NSN 5835-00-275-0584
NSN 6645-00-020-2787
NSN 5855-01-573-3929