Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number A4043 found under Rod Welding by Airco Welding Products. The National Stock Number assigned to this part is 3439002460541, and the Federal Supply Class is 3439 Miscellaneous Welding Soldering And Brazing Supplies And Accessories. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like A4043.