Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number AU4258REV1 found under Transformer Audio F by A R F Products Inc. The National Stock Number assigned to this part is 5950006463127, 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 AU4258REV1.