At One Click Purchasing, we are your reliable source for the NSN part 503-5 manufactured by Prototype Development Inc. We carry a wide range of popular NSN items on our website, including Fan Centrifugal like part number 503-5 which is listed with the NSN 4140000840984 for easy identification. If you are interested in 503-5 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.