90010-ZY3-000 Hex (12X120) Bolt - Overview. The 90010-ZY3-000 Hex (12X120) Bolt is a critical fastening component used in Honda marine engine systems. This hexagonal bolt, measuring 12mm in diameter and 120mm in length, plays an essential role in securely mounting parts and maintaining structural integrity within the marine engine assembly. Crafted to precise factory specifications, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features