Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number TH3397 found under Gear Drive by American Standard Inc. The National Stock Number assigned to this part is 3020007557069, and the Federal Supply Class is 3020 Gear Pulley Sprocket And Transmission Chain. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like TH3397.