At One Click Purchasing, we are your reliable source for the NSN part 840638 manufactured by Eaton Aerospace Ltd. We carry a wide range of popular NSN items on our website, including Shaft Shouldered like part number 840638 which is listed with the NSN 3040012901309 for easy identification. If you are interested in 840638 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.