Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4W5056 found under Cooler Fluid Transm by Caterpillar Inc. The National Stock Number assigned to this part is 3040014580675, and the Federal Supply Class is 3040 Miscellaneous Power Transmission Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 4W5056.