The Omega ER40 Collet is a coolant-sealed, standard-precision collet designed for ER40 tooling. It delivers less than 10 μm run-out and a clamping range of 3-26 mm, providing a precise, reliable grip for milling, drilling, and finishing tasks.

Newer versions have no rubber seal on the nose, and the design features non-overlapping longitudinal slots to prevent coolant loss. For best sealing, use only round shank tooling with no clamping flats; tools with flats will render the seal ineffective.

• Ultra-precise coolant-sealed tolerance: Keeps run-out under 10 μm for dependable, repeatable performance in precision milling and drilling.
• Wide clamping range (3-26 mm): Fits a broad selection of round shank tooling, reducing the need to swap collets during a job.
• Leak-proof seal design: Longitudinal slots do not overlap at the centre to prevent coolant loss; newer noses without a rubber seal simplify maintenance while preserving sealing integrity.

With the ER40 collet, you gain a reliable, consistent grip that supports accurate results and smoother workflows across your milling, drilling, and finishing tasks. The combination of tight run-out, versatile clamping range, and a robust, leak-resistant seal helps reduce tool-related rework and keeps projects moving with confidence.