Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 57A2 found under Loudspeaker Permanent Magnet by Quam Nichols Co. The National Stock Number assigned to this part is 5965009908669, and the Federal Supply Class is 5965 Headsets Handsets Microphones And Speakers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 57A2.