Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number S4004-5239 found under Lamp Incandescent by High Voltage Components Inc. The National Stock Number assigned to this part is 6240014075690, 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 S4004-5239.