Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 0621931-00 found under Parts Kit Seal by Nacco Materials Handling Group Inc. The National Stock Number assigned to this part is 2520003697589, and the Federal Supply Class is 2520 Vehicular Power Transmission Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 0621931-00.