Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1U-0640 found under by Caterpillar Inc. The National Stock Number assigned to this part is 3830015728442, and the Federal Supply Class is 3830 Truck And Tractor Attachments. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 1U-0640.