Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 2520 ITEM NO. 603-2 found under Actuator Electro Mechanical Rota by Mckean Machinery Sales Inc. The National Stock Number assigned to this part is 4810013127373, and the Federal Supply Class is 4810 Valves Powered. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 2520 ITEM NO. 603-2.