Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number NAS1523 found under Packing With Retain by National Aerospace Standards. The National Stock Number assigned to this part is 5330015499140, and the Federal Supply Class is 5330 Packing And Gasket Materials. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like NAS1523.