Meet the Omega ER40 Collet, a coolant-sealed, standard-precision toolholder designed for repeatable, accurate machining with round-shank tooling. This 13 mm model delivers tight run-out and stable toolholding for milling and drilling tasks across metal, plastic, and composite materials.

Featuring a clamp range of 3–26 mm and a robust build, it helps you achieve clean finishes and consistent results. The nose uses a rubber seal in this design, while newer versions have no rubber seal on the nose. To maintain the seal and performance, use only round-shank tooling with no clamping flats—tools with flats will render the collet ineffective.

• Ultra-low run-out (less than 10 μm): Delivers highly repeatable positioning for precise pockets, threads, and fittings, improving part quality and reducing scrap.
• Coolant-sealed design with non-overlapping slots: The slots do not overlap at the centre, helping prevent coolant leakage and keeping your work area cleaner; note that newer versions omit the rubber nose seal.
• Wide clamping range (3–26 mm) for round-shank tooling: Supports a broad range of tools without swapping collets; for best results, use only round-shank tooling with no clamping flats to preserve seal integrity.

When you pair this ER40 coolant-sealed collet with compatible tooling, you gain stable, accurate toolholding, reduced coolant mess, and less downtime spent changing setups. Its rugged construction and versatile clamping range support a reliable workflow across multiple jobs, helping you achieve consistent finishes and longer tool life.