Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4B8117 found under Spacer by Caterpillar Inc. The National Stock Number assigned to this part is 2520001642535, 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 4B8117.