Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 40A1-4522-47 found under Screw Cover by Met Pro Corporation. The National Stock Number assigned to this part is 5305009337227, 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 40A1-4522-47.