Omega Products ER20 Collet Coolant Sealed Ultra Precision - 10 Micron Run-Out - 8mm

The Omega ER20 Collet with coolant seal is a precision tool holder engineered for CNC milling where consistent accuracy and reliable cooling matter. Designed for engineers, machinists, and serious hobbyists, it delivers ultra-stable tool retention and clean, efficient cooling under demanding cutting conditions.

This 8 mm ER20 collet offers a clamping range of 3–13 mm and an ultra-low run-out specification of under 10 microns, helping you achieve better surface finishes and longer tool life. It uses an integral metal seal to manage high-pressure coolant, up to 120 bar, for dependable cooling during tough cuts. Newer versions have no rubber seal on the nose, reducing wear points and simplifying maintenance. Longitudinal slots are arranged to avoid center overlap, further preventing coolant loss.

• Ultra-precise run-out: Delivers consistently accurate tool engagement (less than 10 μm), supporting cleaner finishes and reliable performance across materials.
• High‑pressure coolant sealing (up to 120 bar): An integral metal seal keeps coolant where it belongs, improving cooling efficiency, reducing chip buildup, and extending tool life. Newer versions have no rubber seal on the nose.
• Leak‑resistant nose with non‑overlapping slots: Slot geometry prevents coolant loss at the center, helping maintain cooling and cutting stability. For best results, use only round shank tooling with no clamping flats to preserve the seal.

This collet is designed to integrate seamlessly into standard ER20 toolholding systems, delivering reliable performance in production milling and precision prototyping alike. With its robust construction and thoughtful seal design, you can expect consistent results, reduced downtime, and stronger overall milling performance.