Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number R351570-2REVB found under by Raytheon Company. The National Stock Number assigned to this part is 5840008669693, and the Federal Supply Class is 5840 Radar Equipment Except Airborne. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like R351570-2REVB.