Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 506 4224 found under Bearing Roller Cylindrical by Atlas Copco. The National Stock Number assigned to this part is 3110013201805, 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 506 4224.