The Omega ER40 Collet is a coolant-sealed, standard-precision tool holder designed for milling and drilling with ER40 tooling. It delivers exceptionally tight run-out—less than 10 microns—and a broad clamping range of 3–26 mm, helping you hold round tools securely while maintaining accuracy across projects.

Newer versions feature a nose design without a rubber seal, reducing maintenance and potential contamination points. The collet uses non-overlapping longitudinal slots at the centre to prevent coolant loss, keeping your work area cleaner and protecting cutting performance.

• Less than 10 μm run-out: Delivers highly precise tool holding for tight tolerances and repeatable results across a range of milling and drilling tasks.
• Coolant-sealed design with non-overlapping slots: Prevents coolant from leaking at the nose, helping maintain a cleaner workstation and consistent cutting conditions.
• Wide clamping range (3–26 mm): Accommodates a broad selection of round-shank tools; for optimal sealing, use only round shank tooling with no clamping flats, as flats will render the seal ineffective.

The Omega ER40 Collet provides a dependable, coolant-managed toolholding solution that supports efficient workflows and consistent results. Its combination of tight run-out, leak-resistant design, and flexible clamping range makes it a reliable choice for engineers, machinists, and hobbyists seeking trustworthy performance from their machining setup.