Retention knob installed in toolholderJM Performance Products has introduced its high torque retention knob that it claims works with all existing toolholders.

The company says this retention knob is longer, by design, so all thread engagement occurs in a region of the toolholder where there is a thicker cross-section of material to resist deformation.

It’s claimed that by combining this design of retention knob with the correct torque, spindle contact with the taper is improved to close to 100%.