Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number RA2-4SFM20DB found under Attenuator Fixed by Res Net Microwaveinc. The National Stock Number assigned to this part is 5985015276623, and the Federal Supply Class is 5985 Antennas Waveguides And Related Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like RA2-4SFM20DB.