Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number S1-4-20X7-8N found under Screw Cap Socket Head by A P M Hexseal Corporation. The National Stock Number assigned to this part is 5305001396547, 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 S1-4-20X7-8N.