Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 3137R304 found under Lamp Incandescent by Joint Electronics Type Designation. The National Stock Number assigned to this part is 6240001557805, 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 3137R304.