In contrast, a cold extrusion rebar coupler involves a different methodology. To use this type of coupler, the ends of ribbed rebar are inserted into a specially designed steel sleeve. A hydraulic press is then utilized to compress the cold extrusion coupler, leading to plastic deformation of the coupler. This process creates a mechanical interlock between the deformed coupler and the ribbed rebar, thus securing the connection. Cold extrusion is generally used for II and III grade rebar with diameters ranging from 16mm to 40mm, including reheated processed rebar. There are two primary forms of extrusion: radial extrusion and axial extrusion.

Advantages of Cold Extrusion Rebar Couplers

1. Strong Mechanical Bond: The mechanical locking effect due to deformation ensures a robust connection.

2. No Need for Rotation: Unlike straight threaded couplers, cold extrusion does not require the rebar to be rotated, making it easier in confined spaces or complex structures.