Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 057-0641-50 found under Ring Bearing Outer by Paterson Limited T A Paterson. The National Stock Number assigned to this part is 3110015940783, 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 057-0641-50.