Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 500399-20 found under Bolt Close Tolerance by Dana Light Axle Products Llc. The National Stock Number assigned to this part is 5306012407940, and the Federal Supply Class is 5306 Bolts. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 500399-20.