Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number M42-9643 found under Relay Thermal by Harmony Enterprises Incorporated. The National Stock Number assigned to this part is 5945014515699, and the Federal Supply Class is 5945 Relays And Solenoids. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like M42-9643.