The Omega ER40 Collet Coolant Sealed Ultra Precision is a high‑performance toolholding solution designed for engineers, machinists, and workshop environments that demand repeatable accuracy and reliable cooling. Built for 18mm tooling, it delivers ultra‑precise run‑out (less than 10 microns) and supports a clamping range of 3–26 mm while operating with high‑pressure coolant up to 120 bar. Newer versions feature a nose design without a rubber seal for improved reliability, and the geometry includes non‑overlapping longitudinal slots to prevent coolant loss. To maintain the seal, use only round shank tooling with no clamping flats; tooling with flats will render the seal ineffective.

• Ultra‑precise run‑out: Delivers < 10 micron run‑out under load, ensuring exact tool positioning for tight tolerances and consistently clean finishes even at high spindle speeds.
• High‑pressure coolant seal: Integral metal seal keeps coolant pressurized up to 120 bar, reducing leaks, cooling the cut zone effectively, and extending tool life with less downtime.
• Robust, maintenance‑friendly design: The nose seal on newer versions avoids rubber components, and the non‑overlapping slots minimize coolant escape; ensure you use round shank tooling with no flats to preserve the seal and performance.

This sealed ER40 collet provides reliable, repeatable performance across demanding milling tasks. By combining ultra‑low run‑out with a proven high‑pressure coolant seal, it helps you achieve tighter tolerances, better surface finishes, and longer tool life, while reducing downtime due to leaks or seal failures. The design is straightforward to set up with compatible tools and is built to withstand rigorous shop conditions, giving you confidence in every cut.