The John Deere UC28163 is a genuine OEM stationary knife designed for optimal cutting performance in John Deere agricultural machinery. This essential component ensures efficient operation in S-Series combines including models S650, S660, S670, S670HM, S680, S680HM, S690, S690HM, S760, S770, S780, S785, S790, and 8000/9000 series forage harvesters such as 8100, 8200, 8300, 8400, 8500, 8600, 8700, 8800, 9500, 9600, 9700, 9800, 9900. Manufactured to John Deere's rigorous standards, this stationary knife provides durability and precise cutting for demanding harvesting applications.