Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 517 03 found under Transformer by Velco Products Div Virginia. The National Stock Number assigned to this part is 5950009472844, 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 517 03.