Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 10291 found under Screw Tee Head by Siewek Tool Co Inc. The National Stock Number assigned to this part is 5305009439500, 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 10291.