The ER20 solid sealed collet according to DIN ISO 15488 (DIN 6499) is designed for high-precision machining applications on CNC machine tools where tools with internal high-pressure coolant supply are required. Compared with standard ER collets, this design integrates a mechanical sealing system that prevents coolant leakage, allowing the cutting fluid to be directed through the tool channels directly to the cutting zone.

The coolant sealing function is achieved through the short front slots of the collet, which create a continuous contact surface between the tool shank and the collet body. This configuration prevents pressure loss and ensures that the coolant flows efficiently through the internal lubrication channels of the tool, improving cutting edge cooling and enhancing chip evacuation during machining operations.

The ER20 sealed collet is engineered to withstand coolant pressures up to 120 bar, making it particularly suitable for modern high-performance machining centers, CNC lathes and multitasking machines. The high manufacturing accuracy ensures an average run-out accuracy of ≤ 0.008 mm, guaranteeing rotational stability, reduced vibration and improved surface quality of the machined component.

The clamping range features a 1 mm progression, allowing precise and secure clamping of cylindrical shank tools. The collet structure includes a 4+4 segment design, which provides excellent rigidity and ensures uniform distribution of clamping forces along the tool shank.

These collets are especially suitable for milling, drilling, boring and tapping operations where high concentricity accuracy must be combined with efficient internal coolant delivery. Internal coolant supply improves tool life, stabilizes the machining process and allows better cutting conditions, particularly when machining demanding materials.

Coolant sealing is guaranteed only when the tool shank diameter corresponds exactly to the nominal diameter of the collet and the tool is inserted along the full clamping length, ensuring the correct sealing interface.

Thanks to their combination of precision, rigidity and high-pressure coolant capability, ER20 solid sealed collets are an ideal solution for precision machining workshops, automotive production environments and all industrial applications requiring maximum reliability in tool clamping systems.