Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 11504 found under Transformer Power Autotransformer by Robert M Hadley Company Inc. The National Stock Number assigned to this part is 5950006886138, 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 11504.