The ER40 clamping collets with coolant channels along the bore, compliant with DIN ISO 15488 (DIN6499), are designed to ensure extremely precise and stable tool clamping in high-performance CNC machine tool applications. This type of collet integrates an internal coolant channel system that allows cutting fluid to pass directly through the bore along the tool shank, significantly improving heat dissipation during machining operations and extending tool life.

The specific design with short clamping slots guarantees an effective mechanical sealing of the coolant, preventing pressure losses and ensuring uniform fluid distribution along the tool shank. This technical solution is particularly suitable for deep drilling, milling and high-speed machining operations, where proper chip evacuation and thermal control are critical to process stability.

ERC40SJ collets are manufactured from high-strength alloy steels with dedicated heat treatments that provide excellent rigidity and dimensional stability. The average runout accuracy of 0.008 mm ensures extremely precise tool rotation, reducing vibration, premature wear and machining inaccuracies.

The very narrow clamping range of 0.1 mm allows extremely tight diameter tolerances to be maintained, ensuring an optimal interface between the collet and the cutting tool. This feature makes the collets particularly suitable for precision machining applications, automotive manufacturing and high-quality mechanical production.

The internal coolant system allows operation with pressures up to 120 bar, ensuring efficient lubrication and cooling even in demanding machining conditions and when processing difficult materials. The coolant flows through the internal longitudinal channels, directing the jet precisely to the cutting zone.

To ensure proper sealing and performance, tools must have a shank diameter exactly matching the nominal collet diameter and must be inserted over the entire gripping length. The collets are designed to be mounted in ER nuts with eccentric extraction, enabling secure clamping and quick tool replacement.

Thanks to the combination of precision, rigidity and optimized coolant management, ER40 collets with internal coolant channels represent an ideal solution for industrial applications requiring high reliability, superior surface finish and stable machining processes. They are widely used in CNC machining centers, milling machines and automated manufacturing systems, improving productivity and tool performance.