Mechanical connections has four types:

Rebar sleeve extrusion connection

It is used for on-site connection construction of grade Ⅱ and Ⅲ hot-rolled ribbed steel bars with a diameter of Ф20-32mm in reinforced concrete structures according to the requirements of first and second-level seismic fortification.

Rebar taper thread sleeve connection

It is used for the connection between steel bars with the same diameter or different diameters of Ф18-50mm grade II, III, and IV ribbed steel bars (including poorly weldable steel bars).

Reinforcement upset straight thread sleeve connection

It is used for the on-site connection construction of II, III grade vertical, oblique or horizontal steel bars with a steel bar diameter of Ф16-40mm in the concrete structure of industrial and civil buildings.

Steel bar rolling straight thread sleeve connection

Steel bar rolling straight thread sleeve connection is utilizes the characteristics of plastic deformation of metal materials and cold hardening to enhance the strength of metal materials, so that the joint and the base metal are equally strong. According to the rolling straight thread forming method, it can be divided into three types: direct rolling thread, extruded rib rolling thread, and stripped rib rolling thread.