At One Click Purchasing, we are your reliable source for the NSN part 70638 manufactured by Caterpillar Work Tools Inc. We carry a wide range of popular NSN items on our website, including O Ring like part number 70638 which is listed with the NSN 5331012893128 for easy identification. If you are interested in 70638 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.