Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number P12 656CM AND 597 323CM found under Pad Thrust Ahead by Michell Bearings Member Of Rolls Roy. The National Stock Number assigned to this part is 3120997993104, and the Federal Supply Class is 3120 Bearings Plain Unmounted. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like P12 656CM AND 597 323CM.