Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number NH20-20-1-425-1 40 found under Nut Plain Hexagon by Hermetic Seal Corporation. The National Stock Number assigned to this part is 5310005657102, and the Federal Supply Class is 5310 Nuts And Washers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like NH20-20-1-425-1 40.