The superior method for joining tubing to flanges and fittings.

Easily create secure, leak-proof joints between ductile tubular products and fittings with the Elliott Mechanical Joining Tool.

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Superior joints

  • Creates secure, leak-proof joints between ductile tubular products and fittings.
  • Mechanically joined joints will not leak, pull apart, or vibrate loose due to temperature change or pressure.
  • Superior to a welded, brazed, or crimped joint.

Roll to a torque or diameter spec

  • Rolling to a torque ensures consistent results regardless of tolerance and variations of the tube OD, wall thickness, and component ID.
  • Rolling to a diameter guarantees a consistent ID of the tube. This makes it possible to “iron out”and round up the ID of the tube.


  • Practically every tubing material except plastic can be mechanically joined, providing the tube is annealed or is ductile.
  • Annealed and ductile materials include: steel, stainless steel, aluminum, titanium, copper, cupronickel, iconel, etc.


  • Limited training required to operate
  • Used on manual electric rolling motors, special machines and in rare cases on CNC machines.

Operating Procedure

1) 0% Expansion

The tube is inserted into the flange and the mechanical joining tool is inserted into the tube.

1) 25% Expansion

When the tube has been rolled to roughly 25% of the total expansion required, the tube will make metal-to-metal contact with the flange.

3) 50% Expansion

At this point the tube metal has begun to flow into the grooved serrations of the flange.

4) 100% Expansion

Grooved serrations are now completely filled and the tube metal has flowed to the point of least resistance beyond the flange resulting in a mechanically formed joint that will not leak, vibrate loose or pull apart.

Technical Reference and Downloads