Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number JS4N found under Insert Flexible Cou by Emerson Electric Co. The National Stock Number assigned to this part is 3010012301603, 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 JS4N.