Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 57A5A47-4 found under Setscrew by Navair And Navsea Managed. The National Stock Number assigned to this part is 5305002062080, 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 57A5A47-4.