Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number P4855 found under Adjuster Slack Brake by Koehring Co. The National Stock Number assigned to this part is 2530006402313, 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 P4855.