Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number NK520DD10R8 found under Screw Cap Socket Head by Dutch Valley Supply Co. The National Stock Number assigned to this part is 5305010165513, 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 NK520DD10R8.