Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B538DD found under Bearing Ball Airframe by Ina Bearing Co Inc. The National Stock Number assigned to this part is 3110001419794, 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 B538DD.