Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 057 520 found under Piston Compressor by Sauerjp And Sohn Maschinenbau Gmb. The National Stock Number assigned to this part is 4310016063169, and the Federal Supply Class is 4310 Compressors And Vacuum Pumps. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 057 520.