Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 50280-0503 found under Bearing High Speed by Timken Gears And Services Inc. The National Stock Number assigned to this part is 3110010988973, and the Federal Supply Class is 3110 Bearings Antifriction Unmounted. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 50280-0503.