Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 340050021 found under Roll Tube Expander by Thomas C Wilson Inc. The National Stock Number assigned to this part is 2825008969497, 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 340050021.