The gap in your car, that is where the problem hides.


The diagram righthandabove illustrates where the body and subframe come together on a mass production car. Even when the special bolts are tightly fastened, the gap in the bolt hole remains unfilled. The pressed surface of the body can also be uneven, which
could deteriorate the adhesion between the body and subframe, becoming the root cause for micro vibrations. These gaps and uneven surfaces can become detrimental to the overall body rigidity. This is the gap problem we consider to be critical.

RIGIDCOLLAR(リジカラ) fills the gap between the body and subframe.


RIGIDCOLLAR(リジカラ) is inserted between the body and subframe by lifting up your vehicle, loosening the joint bolts one by one, then tightening them back together.

The tapered portion of RIGIDCOLLAR(リジカラ) deforms as the bolt is tightened,
filling the gap between the bolt and the inner wall of the bolt hole.


When the RIGIDCOLLAR(リジカラ) is set and the bolt gets tightened, the tapered portion begins to deform, filling in the gap between the inner wall of the bolt hole and the bolt. Meanwhile, the clearance between the RIGIDCOLLAR(リジカラ) and the bolt also gets eliminated due to constriction. Innovation ① & ② work simultaneously towards achieving the ultimate level of rigidity.

In the final stage of bolt tightening, the RIGIDCOLLAR(リジカラ) eliminates any gap that maybe present from the uneven steel surface, achieving the ultimate fastness.


As the bolt is further tightened by the specified torque, the flange portion flattens out and acts as a filler between the two surfaces (body & subframe). This solidifies the fastening strength between the body and subframe. By installin RIGIDCOLLAR(リジカラ), the overall torsional stiffness of the car improves by 5 ~ 6,000Nm/deg achieving significantly higher body rigidity.

* Nm/deg : unit of torsional stiffness. Average torsional stiffness of mass production cars is 25,000Nm/deg.