Stainless Steel, Silicon Bronze, Brass, and galvanized to choose from. There are a variety of sizes, even metric!
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It only makes sense that you should use a Type 316 Marine grade Stainless Nut with your 316 Stainless Carriage Bolt or Hex Cap. Remember though that Stainless Steel will sometimes seize or gall when tightened under load--especially with larger sized fasteners. To prevent this apply a little Never-Seize or Anti-seizing compound.