At One Click Purchasing, we are your reliable source for the NSN part 21-640 manufactured by Pollak Joseph Corp. We carry a wide range of popular NSN items on our website, including Switchcentrifugal like part number 21-640 which is listed with the NSN 5930016745670 for easy identification. If you are interested in 21-640 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.