The John Deere CC21085 Lock Ring is a genuine OEM component designed for secure fastening within various John Deere agricultural and industrial machinery. This essential lock ring ensures proper component retention and operational integrity across a wide range of models, including S-Series combines, CP-Series cotton pickers, 8000 and 9000 series forage harvesters, R-Series self-propelled sprayers, and CH-Series sugar cane harvesters. Manufactured to John Deere's rigorous standards, it provides reliable performance and precise fitment.