Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number M477-9 found under Screw Cap Socket Head by R And M Fluid Power Inc. The National Stock Number assigned to this part is 5305013970892, 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 M477-9.