The Omega ER40 Collet is a coolant-sealed tool holder designed for high-precision milling and drilling. It delivers reliable toolholding with coolant delivered directly to the cutting edge, helping machinists, engineers, and hobbyists achieve repeatable results in demanding work.

Engineered for high-pressure cooling up to 120 bar and a clamping range of 3–26 mm, this collet maintains tight alignment under load. Newer versions have no rubber seal on the nose, reducing maintenance and potential wear while preserving sealing performance.

• Ultra-precision run-out (<10 μm): Ensures tight concentricity and consistent surface finish, improving part accuracy across multiple passes.
• Integral metal seal for high-pressure cooling: Delivers reliable coolant delivery up to 120 bar while minimizing leaks, supporting demanding machining cycles.
• Non-overlapping longitudinal slots: Prevents coolant loss at the center for stable pressure at the cutting edge; use only round shank tooling with no clamping flats to complete the seal—flats will render the seal ineffective.

Together these features translate to clearer Tool-to-Part alignment, reduced downtime, and more consistent results in every job—from prototype runs to high-volume production. The ER40 coolant-sealed design helps you keep tool life, finish quality, and throughput steady, so you can focus on precision and productivity with confidence.