Coupling nuts
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Material
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Stainless steel 18-8
A corrosion resistant steel alloy. The most common stainless steel for general hardware use.
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Stainless steel 316
A highly corrosion resistant grade of stainless steel. Ideal in salt water and chlorine environments.
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Zinc plated steel
A low carbon steel for general use. Zinc plated for moderate corrosion resistance.
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Steel plain finish
A low carbon steel for general use. Unplated finish.
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Hot dipped galvanized steel
A low carbon steel for general use. Hot dipped galvanized is a coating for very good corrosion resistance.
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