The Omega ER40 Collet is a coolant-sealed, standard-precision tool holder designed for milling and drilling tasks where reliable coolant management and tight run-out are essential. It accepts round-shank tooling and delivers dependable grip and consistent performance across demanding workflows.

• Ultra-low run-out (≤10 μm): Delivers exceptionally tight concentricity for precise cuts, repeatable finishes, and longer tool life across multiple parts and setups.
• Efficient coolant containment: The non-overlapping longitudinal slots prevent coolant from escaping at the nose, and newer versions omit the rubber seal for a streamlined, maintenance‑friendly design.
• Round-shank compatibility with clear guidelines: Designed to be used only with round-shank tooling that has no clamping flats to maintain the seal and ensure reliable performance.

With its 3-26 mm clamping range and a focused, durability-driven build, this coolant-sealed ER40 collet helps you achieve accurate, clean finishes while reducing setup time and downtime. It’s a reliable choice for workshops and job sites that value predictable results and efficient coolant management across a variety of tooling.