Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4 3 8 4017U found under Bearing Assembly Th by Kingsbury Inc. The National Stock Number assigned to this part is 2825001325108, and the Federal Supply Class is 2825 Steam Turbines And Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 4 3 8 4017U.