At One Click Purchasing, we are your reliable source for the NSN part 21-00042 manufactured by Phoenix Microsystems Inc. We carry a wide range of popular NSN items on our website, including Reactor like part number 21-00042 which is listed with the NSN 5950014079600 for easy identification. If you are interested in 21-00042 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.