Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4W5057 found under Cylinder Actuating Linear by Caterpillar Inc. The National Stock Number assigned to this part is 3040013390509, 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 4W5057.