Techniks 04211-02.5 ER11 Collet 2.50mm

Product Description

The TECHNIKS 04211-02.5 is an ER11 series collet designed for precision workholding in CNC machining centers, milling machines, and high-speed spindle applications. With a 2.50mm collet size and a total indicator runout (TIR) of 0.0050mm, this collet delivers the concentricity required for accurate tool holding in tight-tolerance work. Through-coolant capability allows cutting fluid to flow directly to the tool tip, supporting chip evacuation and tool life in demanding cutting operations. Machinists and CNC setup technicians are the primary users.

This ER11 collet is suited for light-duty CNC milling, drilling, and routing applications where small-diameter tooling is standard. The ER11 series is one of the most widely used collet standards in precision machining, making this collet a common replacement or additional unit in shops running ER11-compatible toolholders and spindles. It is appropriate for both production environments and tool room use where small shank tools in the 2.50mm range are regularly deployed.

Key Features

• ER11 collet series - one of the most widely supported collet standards in CNC machining
• 2.50mm collet size for small-diameter tool shanks
• TIR of 0.0050mm for high concentricity and accurate tool positioning
• Through-coolant compatible for direct coolant delivery to the cutting zone

Compatibility

Designed as an OEM-style replacement or supplemental collet for ER11-compatible toolholders and spindle systems.

Installation Notes

ER collets are installed by machinists and CNC technicians using an appropriate ER11 collet nut and spanner wrench. Power down and lock out the spindle before changing collets. Inspect the collet and toolholder bore for debris or damage before seating the collet, as contamination will directly affect TIR and tool concentricity. Do not overtighten the collet nut beyond the toolholder manufacturer's specified procedure.