Techniks 04220-02.5 ER20 Collet 2.50mm Through Coolant

Product Description

The TECHNIKS 04220-02.5 is an ER20 series collet designed for precision CNC machining and toolholding applications. It accepts a 2.50mm tool shank and delivers a total indicator runout (TIR) of 0.0002 inches (0.0050mm), making it suitable for close-tolerance work where concentricity matters. The collet features through-coolant capability, allowing cutting fluid to pass directly to the tool tip for improved chip evacuation and tool life. Machinists and CNC setup technicians install this collet into compatible ER20 collet chucks as part of standard toolholding setups on milling machines, machining centers, and CNC lathes.

This collet is used in production and job-shop environments where ER20 toolholding systems are standard. Its 2.50mm bore size makes it appropriate for small-diameter end mills, drills, reamers, and other cutting tools with matching shank dimensions. Through-coolant support suits applications involving deep-hole drilling or high-speed cutting where flood coolant alone is insufficient to reach the cutting zone.

Key Features

• ER20 collet series for use with standard ER20 chucks and collet holders
• 2.50mm collet bore size for precision small-diameter toolholding
• TIR of 0.0002 inches (0.0050mm) for close-tolerance concentricity
• Through-coolant capability directs fluid directly to the cutting edge
• Lightweight at 0.5 pounds for easy handling during toolchanges

Compatibility

Designed as an OEM-style replacement or direct-fit collet for use with standard ER20 collet chucks and toolholding systems accepting the ER20 collet series.

Installation Notes

Installation is performed by qualified machinists or CNC tooling technicians. The machine spindle must be stopped and all motion fully arrested before changing collets. The collet should be seated properly in the ER20 chuck nut before tightening with the appropriate collet wrench to manufacturer-specified torque; do not use impact tools. When through-coolant is used, verify that the coolant passage in the chuck and spindle is clear and that system pressure is within the machine's rated range before running.