Secure ER collets inside collet chucks and fixtures. Tightening these nuts squeezes the collet around the cutting tool to clamp it firmly in place.

Hold collets tightly in CNC machines with HSK taper spindles for milling, drilling, and routing. Made from high-grade nickel chrome-moly steel, these chucks remain rigid and accurate while resisting wear. They’re also precisely balanced for high speeds, which leads to longer tool life and better finishes on workpieces compared to less balanced chucks. They meet DIN and ISO standards for compatibility across machines with HSK spindles.

These chucks have nuts with internal ball bearings for the smoothest and most uniform clamping. This results in a stronger grip, better accuracy, and less wear on your tool. Insert your collet and tighten the nut to clamp your tool in place. They have a collet stop screw that sets the tool depth in the chuck for consistent, repeatable performance when you change tools. An RFID chip hole holds a small RFID tag for automatic tool identification and tracking.

To route coolant through these chucks without washing away the grease in your spindle, install HSK coolant tubes. If you have a machine that sends coolant through the spindle, pair them with an ER coolant control collet for the best results.

To maximize grip and minimize runout, choose a chuck where your tool diameter falls in the middle of the bit shank size range.

Hold collets tightly in CNC machines with dual-contact CAT taper spindles for milling, drilling, and routing. These chucks contact both the taper and spindle face for a more rigid hold than standard chucks. The added rigidity improves accuracy and surface finish while reducing vibration. Made from high-grade nickel chrome-moly steel, these chucks remain stable and accurate while resisting wear—even at high speeds. They’re balanced to G 2.5, further reducing vibration to extend the life of your collets, bits, and spindle. Precision ground to the industry standard AT3 tolerance, these chucks maintain a secure fit that minimizes runout in your machine spindle. They meet ASME standards for CAT spindles to ensure compatibility.

While these chucks are designed for Big-Plus and other dual-contact CAT spindles, they can also be used in standard CAT spindles, just without the added rigidity of the dual contact.

Internal threads on the shank let you attach a retention knob, so you can connect these chucks to your machine’s drawbar system. Insert your collet and tighten the nut to clamp your tool in place. They have a collet stop screw that sets the tool depth in the chuck for consistent, repeatable performance when you change tools. An RFID chip hole holds a small RFID tag for automatic tool identification and tracking. These chucks can deliver coolant to your tool’s cutting edge to clear chips and extend tool life. If you have a through-spindle coolant (TSC) machine, pair them with an ER coolant control collet for the best results.

To maximize grip and minimize runout, choose a chuck where your bit diameter falls in the middle of the bit shank size range.