Straight threaded socket connection is a kind of socket connection. Socket connection is actually commonly known as rebar mechanical connection. According to the "JGJ107-2016 Rebar Mechanical Connection Technical Regulations": The commonly used types of rebar mechanical connection joints are as follows：

　　Sleeve extrusion joint: A joint formed by the plastic deformation of the steel sleeve of the connecting piece and the tight bite of the ribbed steel bar through the extrusion force.

　　Tapered threaded joint: A joint formed by the bite of a special tapered thread at the end of the steel bar and the tapered thread of the connecting piece.

　　Upsetting straight threaded joint: A joint formed by the bite of the straight thread and the thread of the connecting piece after the upsetting of the steel bar end.

　　Rolling straight threaded joint: A joint formed by the bite of the straight thread and the thread of the connecting piece directly rolled by the end of the steel bar or rolled after stripping the ribs.

　　Molten metal filling joint: A joint formed by the reaction of a high-heat agent to produce molten metal filling between the steel bar and the connecting sleeve.

　　Cement grouting filling joint: The joint formed after hardening between the steel bar and the connecting sleeve is filled with special cement slurry.