Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number CN 42A UP found under Attenuator Fixed by Lexan Industries Inc. The National Stock Number assigned to this part is 5985005189572, 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 CN 42A UP.