92101-08030-4J Hex (8x30) Bolt - Overview. The 92101-08030-4J Hex (8x30) Bolt is a critical fastening component designed specifically for Honda marine engine systems. This hex-head bolt, measuring 8mm in diameter and 30mm in length, plays a vital role in securing various parts together, ensuring the stable and reliable operation of your marine engine. Manufactured to meet OEM specifications, it guarantees perfect fit and integration with existing hardware, maintaining optimal performance and dur