Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4N406 found under Gear Spur by Caterpillar Inc. The National Stock Number assigned to this part is 3020010240102, 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 4N406.