Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number H38-4MPDX found under Lamp Mercury Vapor by American National Standards Inst. The National Stock Number assigned to this part is 6240008878103, 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 H38-4MPDX.