At One Click Purchasing, we are your reliable source for the NSN part S-20421 manufactured by Nylok Corporation. We carry a wide range of popular NSN items on our website, including Nut Self Locking He like part number S-20421 which is listed with the NSN 5310011523028 for easy identification. If you are interested in S-20421 item, then take the advantage of our online RFQ service, or peruse our website as you see fit to find other items of interest that you may wish to learn more about.