ER20 DIN 6499 (DIN ISO 15488) collets with coolant sealing are designed for tool clamping in CNC machining applications where coolant management and system stability are critical to achieving high-quality results. The ER20 range, with a clamping capacity from 3 to 13 mm, offers an optimal balance between versatility, clamping performance, and precision for medium-sized components.

The operating principle is based on the standard ER geometry, ensuring uniform elastic clamping along the entire tool shank, providing balanced force distribution and reducing transmission play between tool and spindle. The neoprene inserts integrated within the collet slots play a key role in coolant sealing: positioned within the 30° taper, they isolate and direct the coolant exclusively through tools with internal channels, preventing leakage and optimizing lubrication and cooling efficiency up to 25 bar.

From a metrological perspective, ER20 sealed collets provide high concentricity and clamping stability, reducing form errors and geometric deviations during machining. Increased system rigidity minimizes vibrations, improving surface finish and extending tool life, particularly in high-speed or heavy-duty machining operations.

The application range includes milling, drilling, boring, and finishing processes on metallic materials, where controlled internal coolant delivery is essential for chip evacuation, thermal control, and process continuity. Proper collet selection based on tool diameter, clamping length, and tool holder configuration is essential to ensure optimal performance and repeatability.

These collets are widely used in high-demand industrial sectors such as automotive, precision engineering, mold making, and CNC production environments, where accuracy, stability, and process control are critical for achieving consistent and optimized manufacturing results.