Omega's ER40 Collet with coolant seal is a precision toolholding solution built for demanding milling and drilling tasks. Sized for 13 mm tooling, it delivers ultra-precise run-out (under 10 microns) while supporting a broad clamping range and robust coolant delivery. Designed for engineers, machinists, and hobbyists alike, it helps you achieve accurate, repeatable results across a variety of materials and applications.

Newer versions feature an all-metal seal with no rubber nose seal, enhancing durability under high-pressure cooling. The system is engineered for up to 120 bar coolant pressure and a clamping range of 3–26 mm, delivering reliable coolant delivery directly to the cutting edge. The center-slot geometry is specially arranged so the longitudinal slots do not overlap at the centre, reducing the risk of coolant loss. For best results, use only round shank tooling with no clamping flats—tooling with clamping flats can render the seal ineffective.

• Ultra-precise run-out: Delivers better than 10 μm run-out for tight tolerances and superior surface finish, even at higher feed rates.
• High‑pressure coolant seal with integral metal seal: Supports coolant delivery up to 120 bar with a durable metal seal, increasing reliability in tough machining environments.
• Non-overlapping center slots: Slot arrangement minimizes coolant leakage, ensuring consistent cooling exactly where the cut happens.

This combination of precise tool holding, robust sealing, and thoughtful slot design translates into more consistent part quality, reduced downtime for coolant management, and greater confidence in high-pressure milling and drilling operations.