At One Click Purchasing, we are your reliable source for the NSN part 4-40UNCW manufactured by British Standards Institution. We carry a wide range of popular NSN items on our website, including Washer Flat like part number 4-40UNCW which is listed with the NSN 5310010456617 for easy identification. If you are interested in 4-40UNCW 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.