Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SHURE522 found under by Advanced Simulation Technology Inc. The National Stock Number assigned to this part is 5830016259168, and the Federal Supply Class is 5830 Intercommunication And Public Address Systems Except Airborne. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like SHURE522.