Did you know that GDP Tool holders can be run bi-directional? Tool holders with a static nut (even those with a “powercoat” finish) cannot run in a left hand rotation and you will need a left hand tool holder if you want to run a tool counter-clockwise tool? In case you didn’t know, one of the big benefits of a ball-bearing collet nut on HSK/ISO toolholders (apart from preventing tool slippage) is making the need for a left-hand tool holder obsolete! And if you are not sure if you are using collet nuts with a ball bearing, the above photo shows the difference. The one on the right is a two-piece construction which houses the ball bearing. The one on the left is a simple static nut that cannot be run in a counter clockwise rotation and for which you need a complete new tool holder since the threads on the tool holder would not allow you to just change out the nut. It is worth noting that the difference in pricing of an HSK or ISO tool holder can account for as much as $50 if the tool holder has a static versus a bearing nut. That extra investment is well worth it because the bearing nut will provide a concentric and even grip of the collet (including the tool mounted therein) and thus deliver a better finish and higher accuracy. Another advantage of ball bearing collet nut on a tool holders is the elimination of tool slippage problems. All GUHDO tool holders are made in Germany with the ball bearing collet nut included.
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