At One Click Purchasing, we are your reliable source for the NSN part 521R manufactured by S T K Electronics Inc. We carry a wide range of popular NSN items on our website, including Plug Tip like part number 521R which is listed with the NSN 5935004502863 for easy identification. If you are interested in 521R 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.