At One Click Purchasing, we are your reliable source for the NSN part 4-40UNCN manufactured by British Standards Institution. We carry a wide range of popular NSN items on our website, including Nut like part number 4-40UNCN which is listed with the NSN 5310010397805 for easy identification. If you are interested in 4-40UNCN 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.