Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 643739304 found under Transformer Current by Duffnorton Co Inc. The National Stock Number assigned to this part is 5950012948280, and the Federal Supply Class is 5950 Coils And Transformers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 643739304.