Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number R8505689-SP300 found under Bearing Roller Need by Land Systems Gear Ratio. The National Stock Number assigned to this part is 3110016058000, and the Federal Supply Class is 3110 Bearings Antifriction Unmounted. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like R8505689-SP300.