BTM Metal Clinchers

BTM manufacture the innovative Tog-L-Loc® sheet metal clinching system. The fast, low cost assembly alternative to spot welding, rivets and screws.

How Does It Work?
Tog-L-Loc® is a process known as clinching which cold-forms the part metal using a special punch and die to form a strong interlocking clinch joint. The result of this process is a round, button shaped extrusion on the die side of the assembly, and a small cylindrical cavity on the punch side. The clinch joint requires only the sheet metals that were joined. No external fasteners, or welding is utilized in the process.

Hawker Richardson works closely with business operators and BTM to develop a highly-customised metal clinching solution. To learn more about our metal clinching systems, contact Hawker Richardson today!


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The BTM Tog-L-Loc® joining method is relied upon and trusted by industries worldwide, including automotive, appliance manufacturing, HVAC, furniture making, construction, electrical and much more.

Applications include:

  •  Pre-painted microwave housings
  • Delicate solar collectors
  • Aluminium and electro-coated galvanized steel automotive hoods
  • Aluminized heat shields
  • Galvanized ductwork
  • Garage doors
  • Small dissimilar metal electrical components
  • Steel frame housing

Click here to view more industry and application information

Step-By-Step Process

A typical Tog-L-Loc® clinch joint is created in under a second and features three basic steps as shown in this cross-section diagram:

tog l loc steps CLAMPS

Step 1 (Clamps): A punch side stripper clamps the metals to be joined.

Step 2 (Draws): Next, a punch draws the metals into a die.

Step 3 (Locks): The Tog-L-Loc® die has moving blades which expand, allowing the metals to flow into a strong circular interlock.

The result is a vibration resistant, leakproof clinch joint created without the use of expensive external fasteners or heat to hinder the effect of coatings.


Key Benefits & Features

  • Joins plain, coated, and dissimilar metals - without burning the coating
  • A clinching process - No rivets, screws, or other fasteners are used
  • Eliminates spot welding operations
  • Long tool life: 300,000 joints common
  • Joints are created in a single press stroke
  • Non-Destructive testing with a simple gage
  • Strong, leak-proof joints are highly fatigue resistant
  • Environmentally Friendly process - Creates no sparks, fumes, or soot