What is the most suitable material for bolts attaching a bronze strut to a wood or fiberglass hull vessel?

Silicon bronze bolts are the most suitable material for attaching a bronze strut to a wood or fiberglass hull vessel due to their excellent corrosion resistance and compatibility with both bronze and marine environments. Silicon bronze contains copper, silicon, and a small amount of other elements which enhance its durability, strength, and resistance to galvanic corrosion, particularly in salty marine conditions.

Using silicon bronze minimizes the risk of corrosion that can occur when dissimilar metals, such as brass or stainless steel, are used in contact with bronze. In marine applications, galvanic corrosion can significantly weaken metal components, and silicon bronze effectively prevents this issue. Additionally, silicon bronze has a coefficient of thermal expansion similar to that of bronze, ensuring a better fit and reducing the likelihood of looseness or failure due to thermal cycling.

In contrast, other materials like yellow brass, stainless steel, or galvanized steel are not ideal choices because they can lead to galvanic corrosion when paired with bronze, causing premature degradation of the materials involved. Therefore, silicon bronze is the preferred choice for ensuring the longevity and reliability of fittings in marine applications.