Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 839-2040 found under Standoff Threaded S by Hallmark Electronics Ltd. The National Stock Number assigned to this part is 5340014634088, 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 839-2040.