Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4B8163 found under Shaft Roller by Caterpillar Inc. The National Stock Number assigned to this part is 3040001498994, 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 4B8163.