The Omega ER40 Collet with coolant-sealed design delivers ultra-precise tool holding and high-efficiency cooling for CNC milling. It’s built for engineers, shop-floor machinists, hobbyists, and buyers who need clean chip control, tight tolerances, and reliable performance in demanding operations. To maintain the seal, use only round shank tooling with no clamping flats.

• Ultra-precise run-out (<10 μm): Delivers consistent cutting accuracy, reducing part deviation and the need for extra finishing passes, so you can trust every stroke of your machine.
• High-pressure coolant seal with metal seal (no rubber nose in newer versions): Handles coolant up to 120 bar for efficient cooling and longer tool life, with a robust metal-to-metal seal that resists wear.
• Non-overlapping longitudinal slots: Slots are arranged so they do not overlap at the center, preventing coolant leakage and ensuring stable, even clamping across the full bore.

This combination of precision, durability, and dependable coolant delivery helps you shorten setup times, improve surface finishes, and maintain consistent performance across tough milling tasks. With a clamping range of 3–26 mm and a 23 mm nose size, these collets are built to deliver repeatable results across a broad range of tooling while reducing downtime and maintenance.