Yamaha Motor Company 4H3-23111-00-00 Fork Cap Bolt

The Yamaha 4H3-23111-00-00 Fork Cap Bolt is a threaded fastener that seals and secures the top of the front fork tube, retaining internal components under preload and preserving alignment within the motorcycle’s front suspension. Manufactured as OEM-grade hardened steel or alloy, it uses an OEM-standard thread and a coated surface to resist corrosion on Yamaha motorcycles with model-specific fitment. Used in maintenance, repair, or retrofit projects, this fork cap bolt helps restore fork integrity, maintain suspension performance, and ensure reliable operation by providing proper sealing and structural retention of the fork. Common replacements in the Yamaha lineup include 3Y1-23111-00-00, 2A6-23111-00-00, and 1T3-23111-00-00.