The ER25 sealed clamping collets according to DIN ISO 15488 (DIN 6499) are designed for high-precision tool clamping in machining operations requiring high-pressure internal coolant supply.

These collets, known as Solid Sealed Collets (SSC), feature a mechanical sealing system that prevents coolant leakage between the tool shank and the collet. This design allows the use of high-pressure coolant systems up to 120 bar, enabling efficient cooling directly at the cutting edge.

The coolant flows through the internal lubrication channels of the cutting tool, reaching the cutting zone where it provides effective cooling and assists chip evacuation during machining processes.

The collet geometry incorporates short radial slots, specifically engineered to ensure reliable sealing of the coolant. This design maintains high structural rigidity and stable clamping performance even during demanding machining operations.

The collet body is divided into 4+4 elastic segments, ensuring uniform clamping force distribution and high concentricity accuracy. The average runout accuracy is ≤ 0.008 mm, providing excellent precision for milling, drilling, and boring operations on CNC machining centers and automatic lathes.

Unlike standard ER collets, sealed SSC collets feature a reduced clamping range of approximately −0.1 mm. This limitation ensures optimal sealing performance for internal coolant applications. Therefore, they must be used exclusively with tools having a shank diameter equal to the nominal diameter of the collet, inserted along the entire clamping length.

Thanks to their advanced design, ER sealed collets are particularly suitable for high-productivity machining environments where thermal control, chip evacuation, and machining stability are critical factors influencing tool life and workpiece quality.

ER25 sealed collets are widely used in precision machining, automotive manufacturing, aerospace production, mold making, and high-speed CNC machining, where reliability, accuracy, and efficient coolant delivery are essential.