The Omega ER40 Collet is a coolant-sealed, standard-precision tool holder accessory designed for ER40 systems. It’s built for machinists, engineers, buyers, tradespeople, and hobbyists who value reliable clamping and clean coolant management during milling and drilling.

This collet supports a clamping range of 3–26 mm and delivers 10 μm run-out, helping you achieve accurate cuts, longer tool life, and reduced downtime spent on adjustments. Its design focuses on maintaining coolant where it’s needed while keeping work areas cleaner and safer.

• Wide clamping range (3–26 mm): Versatility to hold a broad range of round shanks, reducing tool changes and expanding the set of jobs you can tackle with a single collet.
• 10 μm run-out precision: Maintains concentricity under load for clean shoulders, tight tolerances, and a superior surface finish on milling and drilling tasks.
• Coolant-sealed design with non-overlapping slots: The slots are aligned to prevent coolant leakage at the nose, helping keep the work area cleaner and protecting both tool and holder. Newer versions have no rubber seal on the nose; to achieve the full seal, use only round shank tooling with no clamping flats—using tools with flats can render the seal ineffective.

With the Omega ER40 Collet, you gain reliable, repeatable performance across a range of jobs, faster setup, and reduced downtime due to coolant leakage or tool instability. The tightly controlled run-out delivers consistent results pass after pass, supporting better precision, finish, and overall machining efficiency.