Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 031-00000039 found under Alignment Test Kit Ocr Reader by United States Postal Service. The National Stock Number assigned to this part is 5180013590397, and the Federal Supply Class is 5180 Sets Kits And Outfits Of Hand Tools. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 031-00000039.