The Omega ER40 Collet is a coolant-sealed, standard-precision tool holder designed for CNC milling and drilling. With a clamping range of 3–26 mm and ultra-tight run-out, it’s built for workshops that demand consistent part quality and reliable coolant management. The design prioritizes precision and ease of use, helping you achieve repeatable results project after project.

Note: newer versions have no rubber seal on the nose, and the longitudinal slots are arranged to prevent coolant loss. For optimal performance, use only round shank tooling with no clamping flats—tools with flats can compromise the seal and the collet’s effectiveness.

• Ultra-precise run-out (<10 μm): delivers highly consistent holding accuracy, improving part tolerances and surface finish while reducing rework.
• Coolant-sealed nose with non-overlapping slots: designed to minimize coolant leakage, keeping the work area cleaner and protecting machining accuracy.
• Versatile 3–26 mm clamping range and round-shank tooling compatibility: broad tool-size compatibility in one collet set; to maintain the seal, use only round shanks with no clamping flats—flats will render the seal ineffective.

This collet is a practical choice for engineers, machinists, and hobbyists who value reliable tool holding, clean coolant management, and repeatable results across a range of common milling and drilling tasks. The combination of tight run-out, sealed design, and user-friendly clamping range helps you streamline setups, reduce downtime, and maintain consistent performance in daily workflows.