Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number U10394 4031 found under Socket Set Socket Wrench by Unisource Technology Inc. The National Stock Number assigned to this part is 5130013790434, and the Federal Supply Class is 5130 Hand Tools Power Driven. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like U10394 4031.