Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 57T4004 found under Transformer Power by A S Vesta. The National Stock Number assigned to this part is 5950222581883, 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 57T4004.