Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4458-004 found under Transformer Power by Reliance Comm Tec Corp Lorain Pr. The National Stock Number assigned to this part is 5950009975225, 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 4458-004.