Also known as extension nuts, use these to connect and extend threaded rods. They're about half the strength of medium-strength steel coupling nuts for use in light duty fastening applications.
Thread Rod Coupling Nut
Zinc-plated steel coupling nuts resist corrosion in wet environments.
Hot-dipped galvanized steel coupling nuts have a thick coating for better corrosion resistance than zinc-plated steel nuts. They must be used with other hot-dipped galvanized fasteners.
Black-oxide steel coupling nuts have a dark surface color and are mildly corrosion resistan in dry environments.
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