Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4F5003 found under Spring Assembly Front Idler by Caterpillar Inc. The National Stock Number assigned to this part is 2530001498899, and the Federal Supply Class is 2530 Vehicular Brake Steering Axle Wheel And Track Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 4F5003.