At One Click Purchasing, we are your reliable source for the NSN part SP440D4B manufactured by Standard Insert Co Inc. We carry a wide range of popular NSN items on our website, including Nut Plain Knurled like part number SP440D4B which is listed with the NSN 5310010078782 for easy identification. If you are interested in SP440D4B 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.