Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SM-18A1 found under Lamp Incandescent by Stanley Electric Mfg Co. The National Stock Number assigned to this part is 6240004987669, 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 SM-18A1.