The ER40 sealing collets with neoprene inserts and external cooling holes according to DIN ISO 15488 (DIN 6499) are designed to provide extremely precise tool clamping and efficient coolant delivery during machining operations on CNC machine tools.

These ER40 clamping collets feature a sealing system based on neoprene inserts positioned in the 30° taper, preventing coolant leakage and directing the coolant flow directly to the cutting zone. The coolant passes through four frontal holes located on the face of the collet, generating a targeted jet that effectively cools the cutting tool, improves chip evacuation and enhances thermal stability during machining.

The 4+4 slot sector design provides an optimal balance between structural rigidity and clamping elasticity, ensuring uniform clamping forces along the tool shank. This configuration enables excellent concentricity performance with an average runout accuracy up to 0.008 mm, which is essential for precision machining operations.

These ER40 collets are designed to operate with tools whose shank diameter exactly matches the nominal collet diameter and are inserted along the entire clamping length. This condition ensures perfect coolant sealing and maximum clamping stability.

With a maximum coolant pressure up to 25 bar, these collets are particularly suitable for high-productivity machining where efficient cooling and chip evacuation are critical to improve surface finish and extend tool life.

The ER40JET series, with a clamping range from 4 to 26 mm and a clamping capacity of 0.1 mm, is compatible with a wide range of ER tool holders used on CNC machining centers, milling machines, lathes and multitasking machines.

Thanks to their precision and reliability, ER40 clamping collets are widely used in automotive manufacturing, aerospace production, mold and die manufacturing, general mechanical engineering and precision machining, where stable tool clamping and controlled coolant delivery are essential for high-quality machining processes.