A straight threaded rebar coupler is a cylindrical steel sleeve equipped with internal threads. This type of coupler comes in two variants: the equal diameter coupler and the varying diameter coupler. When connecting rebar, the threaded ends of two reinforcing bars are directly screwed into both ends of the straight threaded coupler, forming a secure connection.

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.

Key Differences Between Straight Threaded and Cold Extrusion Rebar Couplers

1. Method of Connection:

   - Straight Threaded Rebar Coupler: Uses two pipe wrenches to tighten the coupler around the rebar.

   - Cold Extrusion Rebar Coupler: Utilizes an extrusion machine to compress and secure the rebar through mechanical locking.

2. Installation Process:

   - For straight threaded connections, the rebar must be threaded into the coupler, requiring rotational movement.

   - Cold extrusion involves simply inserting the rebar into the coupler sleeve without any rotational requirement.

3. Applications:

   - Straight Threaded Couplers are more suited for applications needing higher tensile strength.

   - Cold Extrusion Couplers are advantageous in quickly forming reliable joints, especially in various angles and close quarters.

In conclusion, the choice between a straight threaded rebar coupler and a cold extrusion rebar coupler ultimately depends on the specific requirements of the construction project, including the type of rebar used, the load it will bear, and the working conditions. Understanding the differences between these two coupler types can help engineers and construction professionals select the most suitable method for rebar connections, ensuring both strength and reliability in their structures.