Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number BACS12ER3K15 found under Screw Machine by The Boeing Company. The National Stock Number assigned to this part is 5305016472924, 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 BACS12ER3K15.