Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number NAS520-6-32 found under Hose Air Duct by National Aerospace Standards. The National Stock Number assigned to this part is 4720011892131, and the Federal Supply Class is 4720 Hose And Flexible Tubing. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like NAS520-6-32.