Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 388-042 found under Relay Electromagnet by Johnson E F Co. The National Stock Number assigned to this part is 5945005645421, and the Federal Supply Class is 5945 Relays And Solenoids. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 388-042.