Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 3978-2 found under Screw Cap Hexagon H by Korfund Dynamics Corp. The National Stock Number assigned to this part is 5305012781993, 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 3978-2.