Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 840020 found under Diaphragm Chamber Brake by David Brown Special Products Ltd. The National Stock Number assigned to this part is 2530002501973, 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 840020.