Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 04181 found under Ballast Lamp by Barnstead Thermolyne Corporation. The National Stock Number assigned to this part is 6250014887888, and the Federal Supply Class is 6250 Ballasts Lampholders And Starters. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 04181.