Specifications

Parlec stocks over 100 different styles of retention knobs.

• Material, heat treat, and dimensions are to ANSI specifications.
• Manufactured using alloy steel.
• Case hardened to ensure long service life.
• Core is tempered for tough shock resistance.

WARNING:

Machine tool manufacturers have used many various styles and sizes of retention knobs. They often look very similar and appear to be interchangeable. The use of the incorrect knob, or the incorrect use of a knob, may result in injury or property damage. We at Parlec try to ensure that we specify the correct knob, but due to the variety, it is the responsibility of the end user to check that the supplied knobs are correct for the machine tool and taper type.

It is very important not to intermix metric retention knobs with inch toolholders. The retention knob will screw in and appear to seat correctly. This is not the case, and damage may occur if used. All standard metric retention knobs have a pilot behind the flange which seats against the nose of the taper. This will assist in identifying a metric knob where both styles are used. However, retention knobs manufactured to a customer’s specifications may have a shoulder on an inch knob. Parlec offers metric knobs for most machines to permit the use of metric toolholders.

Be sure to fully tighten the retention knob. Failure to do so may result in the toolholder coming loose during operation.

Ordering Instructions:

Parlec stocks over one hundred different styles of retention knobs. Please provide a drawing of your knob or supply the information on the retention knob quotation request sheet. Please measure as accurately and completely as possible. If no coolant hole exists, or if, in the case of the DIN style knob, the hole does not go completely through the part, please note. Be sure to include the angle and the thread, or taper size and type.