Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 42MRA-5000 found under Fiber Optic Transmitting Receivi by Electronic Controls Co. The National Stock Number assigned to this part is 6030012325798, and the Federal Supply Class is 6030 Fiber Optic Devices. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 42MRA-5000.