Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number A-A-58084 found under Protector Hearing by Federal Commercial Item Description. The National Stock Number assigned to this part is 4240000222946, and the Federal Supply Class is 4240 Safety And Rescue Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like A-A-58084.