Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number BACS12CK04-4 found under Screw Machine by 3 V Fastener Co Inc. The National Stock Number assigned to this part is 5305016424869, 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 BACS12CK04-4.