Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SK5320-503Z found under Gear Spur by Landers Frary And Clark. The National Stock Number assigned to this part is 3020006404542, 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 SK5320-503Z.