Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1 4 20 X 5 8 found under Screw Cap Hexagon H by Saginaw Products Corporation. The National Stock Number assigned to this part is 5305016261845, and the Federal Supply Class is 5305 Screws. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 1 4 20 X 5 8.