Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1-550-2411 found under Lamp Incandescent by Cincinnati Machine Co. The National Stock Number assigned to this part is 6240004021791, and the Federal Supply Class is 6240 Electric Lamps. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 1-550-2411.