JM Retention Knobs
outperform the competition

Retention Knobs are the most critical link between tool and machine

For years the retention knob has not been looked at as a critical component. A retention knob can be your first source of chatter, poor tool life, and run out. With an increase in drawbar force, higher feed rates, and exotic materials, load forces being placed on retention knobs have greatly increased.  A common misconception is that retention knobs do not wear out. Retention knobs used under standard 8 hour shifts should be inspected regularly and replaced at least every 3 years. If the shop is running 24 hours a day, the retention knob is only good for one year.  In addition, when installing new tooling, a new retention knob should be used.

JM Performance Products' retention knobs are the highest quality retention knobs on the market. We take the extra step and expense to cut the threads on our knobs.  Our cut threads are of UNJ series and have radius thread points. Radius threads help increase the strength of the knob.

Currently we manufacture over 400 different styles of retention knobs and custom manufacture knobs for unique situations. We manufacture BT, DIN, ISO and CAT style knobs from 30 Taper to 60 Taper.