Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 12173501 found under Caliper Assembly Disc Brake by Kelsey Hayes Company Inc. The National Stock Number assigned to this part is 2530012653279, 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 12173501.