Chainplate

A strong metal plate, usually stainless steel, bolted to a boat’s hull or deck to which the shrouds or stays of the rigging are attached. 

Chainplates are critical structural components of a sailing vessel, serving as the secure attachment points for the standing rigging that supports the mast. They are typically made of stainless steel or another corrosion-resistant metal and are bolted through the hull or deck, often reinforced with backing plates to distribute the load. The chainplates must withstand significant forces, particularly in strong winds or rough seas, as they help maintain the mast’s stability and overall rig integrity. 

Over time, chainplates can suffer from wear, corrosion, or stress fractures, particularly in saltwater environments where metal fatigue and crevice corrosion can occur. Regular inspection and maintenance are essential to ensure their integrity, as failure of a chainplate can lead to dismasting, a serious and potentially dangerous situation. Some boats have externally mounted chainplates, while others have them hidden inside the hull, making inspection more challenging. 

Proper installation and maintenance of chainplates are crucial for the safety and longevity of a sailing vessel, and they are often replaced or reinforced as part of a boat’s long-term upkeep.