Pull Stud - Retention Knob Section

Retention Knobs

CDTooling retention knobs are manufactured from hot-rolled 8620H fine grain steel.

They are shot penned to relieve stress, and hard turned or superior fit and finish.

Our knobs are laser marked with the date of purchase to help determine the life span.

For tractability purposes, each knob is lasered with a part number, serial number, and lot number.

All of our knobs are made in the USA from USA manufactured materials.

We stock over 400 different styles of retention knobs including adapters for NMTB tool holders.

Retention knobs come packaged in individual containers with identification prints on each container.

Retention knobs should be inspected yearly for cracks and wear and replaced every three years.

(Based on a 40 hour week under normal conditions.)

High Torque Retention Knobs

High Torque Retention Knobs are designed to improve the fit of the tool holder with the spindle.

When a traditional retention knob is installed into a tool holder, the threads expand the thin walls of the small end of the tool holder.

When the tool holder is expanded, it is riding on the high points of the holder and not fully mating with the spindle.

This allows the tool holder to move in the spindle creating harmonics, chatter, poor tool life, and excessive tool holder and spindle wear.

Patent-pending High Torque design, which prevents the small end of the tool holder from expanding by using a precision pilot,

and placing the force of the threads into a deeper cross-section of material in the tool holder. When the tool holder properly mates with the spindle,

rigidity is improved. The tool holder now properly mates with the spindle, reducing tool holder harmonics, increasing tool life, and improving finishes