Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 2A4871 found under Thumbscrew by Caterpillar Inc. The National Stock Number assigned to this part is 5305003639315, 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 2A4871.