Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number M770B found under Insert Flexible Cou by Magnaloy Coupling Co Div Of. The National Stock Number assigned to this part is 3010014699456, and the Federal Supply Class is 3010 Torque Converters And Speed Changers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like M770B.