Omega's ER25 Collet with coolant seal delivers ultra-precise toolholding for demanding milling applications. Designed for engineers, machinists, and hobbyists alike, it provides reliable high-pressure coolant delivery and sub-10 μm run-out to keep cutting tools centered and finishes consistent. To preserve the seal, use only round-shank tooling with no clamping flats; tools with flats can render the collet ineffective.

• Ultra-precise run-out: Achieves run-out under 10 μm for tight tolerances, improved concentricity, and cleaner, more consistent surface finishes on every pass.
• High-pressure coolant sealing: Sealed integral metal design supports coolant up to 120 bar with non-overlapping longitudinal slots to prevent leaks; newer versions have no rubber seal on the nose for enhanced durability.
• Versatile clamping range with round-shank compatibility: 3–16 mm tooling range provides broad flexibility while maintaining seal integrity when paired with round-shank tools (avoid clamping flats to keep performance optimal).

This combination of precision, coolant efficiency, and versatile sizing helps you reduce downtime, achieve repeatable results across a wide range of milling tasks, and extend tool life by maintaining balanced, stable tool engagement under high-pressure cooling.