Scaffolding couplers play a crucial role in the scaffolding system, providing the necessary connections to assemble scaffolding structures safely and securely. There are several different types, each with its own characteristics and applications.

The right-angle coupler is one of the common varieties. It is used to connect scaffold tubes at a 90-degree angle, vital for building corners in scaffolding structures. It is designed to join scaffold tubes at a 90-degree angle, enabling the creation of stable corners and right-angled sections in the scaffolding framework. This type is essential for constructing square or rectangular scaffolding configurations. 

Another type is the swivel coupler. This allows for adjustable connections between tubes, providing flexibility in creating various angles and configurations, which enables connections with adjustable angles, useful for creating various configurations especially in non-standard or curved setups. It is particularly useful when dealing with irregular or curved scaffolding designs. Sleeve coupler: Joins two scaffold tubes end to end to extend their length.

The sleeve coupler, also known as a tube coupler, is used to join two scaffold tubes end to end. It provides a strong and secure connection to extend the length of the scaffolding tubes as needed.

The putlog coupler is specifically designed for attaching putlogs or horizontal support members to the vertical standards of the scaffolding. It ensures proper support and stability for the working platform.

In conclusion, different types of scaffolding couplers serve specific purposes in scaffolding construction, and choosing the right ones is essential for the safety and functionality of the scaffolding system.