The ER20 clamping collets according to DIN ISO 15488 (DIN 6499) represent one of the most widely used and reliable tool clamping systems in the precision machining industry. Thanks to their versatility and ability to ensure uniform tool clamping, these collets are commonly used in CNC lathes, machining centers and high-precision machine tools.

The ER20 collet design ensures optimal distribution of the clamping force. The body features 16 longitudinal slots, allowing controlled elastic deformation when the collet is tightened inside the collet holder. This configuration allows the collet to perfectly adapt to the tool diameter while maintaining uniform contact along the cylindrical surface, improving clamping stability and reducing vibration during machining operations.

These collets are manufactured according to the DIN ISO 15488 standard, which precisely defines geometry, dimensions and dimensional tolerances. The functional surfaces are finished with a surface roughness of Rz 1.6, ensuring high surface quality and reliable contact between collet, tool and collet holder.

The ER20 system allows clamping of cylindrical tools with diameters ranging from Ø1 mm to Ø14 mm, with a metric progression of 1 mm, enabling precise adaptation to different tool sizes. This feature makes ER collets extremely versatile and particularly suitable for applications requiring frequent tool changes and high dimensional accuracy.

From a geometric perspective, the ER20 collet features compact dimensions optimized to guarantee stability and rigidity during machining operations. The main functional dimensions include an external reference diameter A = 20 mm, a clamping section B = 21 mm, a total length L = 31.5 mm, and a front section H = 11.5 mm. The clamping system uses a taper angle of 8°, allowing efficient force transmission between the collet holder and the collet itself, while the 30° front angle facilitates engagement with the clamping nut.

For specific applications, special diameters and short-length versions are also available, such as the ERC20.D14 collet with a length of 28 mm, designed to reduce axial space in compact tooling setups or in applications where working space is limited.

Due to their precision, robustness and versatility, ER20 collets are widely used in milling, drilling, boring and tapping operations. They are particularly appreciated in precision machining where clamping stability directly affects surface finish, tool life and machining repeatability.

In modern industrial production environments, where productivity and dimensional accuracy are essential, ER20 collets provide a reliable technical solution for secure and precise clamping of cylindrical cutting tools.