Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 56Y40 found under Cap Torch Welding by L Tec Welding And Cutting Systems. The National Stock Number assigned to this part is 3431000188157, and the Federal Supply Class is 3431 Electric Arc Welding Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 56Y40.