Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 45639 found under Gear Set Spur Matched by Triumph Engine Control Systems Llc. The National Stock Number assigned to this part is 3020000888872, 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 45639.