Stainless steel extension nuts, also called coupling nuts, are long cylindrical threaded fasteners with internal threads running through the whole body. They are designed to connect two bolts or extend the thread length of a stud.
Made from 304 or 316 stainless steel, extension nuts feature excellent rust and corrosion resistance. Their through-hole internal thread ensures stable connection and uniform stress distribution. They are commonly used for lengthening studs, assembling machinery frames, pipeline supports and equipment installation where extra thread engagement length is required. Suitable for outdoor, humid and corrosive working environments.