Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4000439 found under Standoff Plain Snap In by 901 D Llc. The National Stock Number assigned to this part is 5340016667993, and the Federal Supply Class is 5340 Hardware Commercial. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 4000439.