Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4N729 found under Cooler Fluid Transm by Caterpillar Inc. The National Stock Number assigned to this part is 2520012685102, and the Federal Supply Class is 2520 Vehicular Power Transmission Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 4N729.