Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number CBS811-04-5 found under Screw Cap Socket Head by C B S Fasteners Inc. The National Stock Number assigned to this part is 5305003105840, 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 CBS811-04-5.