Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number K43021 found under Relay Electromagnet by Ward Leonard Electric Company Inc. The National Stock Number assigned to this part is 5945005523385, 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 K43021.