Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 135688-52 found under Screw Cap Socket He by Raytheon Company. The National Stock Number assigned to this part is 5305010621373, 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 135688-52.