Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number ULTRA-9 CLASSIC-42 found under Lamp Fluorescent by Duro Test Corp. The National Stock Number assigned to this part is 6240013670690, 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 ULTRA-9 CLASSIC-42.