Aluminum : It is relatively soft and prone to tool sticking during cutting. It is recommended to select a sharp, well-lubricated threading inserts to improve cutting efficiency and surface quality.

Cast Iron: It is brittle and prone to cracking during machining. Select a threading inserts with good rigidity and strong wear resistance to ensure machining stability and tool life.

Stainless Steel: It is highly tough and sticky, making it prone to built-up edge. Therefore, select a tool with good chip evacuation and anti-sticking properties, such as with special coatings.

Steel: When machining steel, it is recommended to use carbide threading inserts. Carbide tools have excellent wear resistance and are suitable for machining harder steels. Their good thermal conductivity helps control temperature during machining, ensuring thread accuracy and surface quality.