Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 5H5500 found under Collar Clutch by Caterpillar Inc. The National Stock Number assigned to this part is 2520005629102, 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 5H5500.