Techniks 04220-07 ER20 Collet 7mm Through Coolant

Product Description

The TECHNIKS 04220-07 is an ER20 series collet designed for precision tool holding in CNC machining and milling applications. With a 7mm collet size and a total indicator runout (TIR) of 0.0002 inches (0.0050mm), this collet delivers the concentricity required for tight-tolerance work. The through-coolant design allows cutting fluid to pass directly to the tool tip, supporting longer tool life and better chip evacuation during high-speed operations. At 0.5 pounds, it is a compact, single-piece holding component installed by machinists and tool room technicians.

This collet is suited for use in machine shops and manufacturing environments where ER20-compatible spindles and toolholders are in service. Typical applications include drilling, reaming, tapping, and end-mill operations on CNC machining centers and manual mills equipped with ER20 collet chucks. The through-coolant port makes it a practical choice for operations where direct coolant delivery to the cutting zone is required for heat management and chip control.

Key Features

• 7mm collet size for consistent, repeatable tool clamping
• Low TIR of 0.0002 inches (0.0050mm) for high-precision concentricity
• Through-coolant capable for direct fluid delivery to the cutting edge
• ER20 series compatibility fits standard ER20 collet chucks and toolholders
• Lightweight at 0.5 pounds for easy handling and quick changeouts

Compatibility

Designed as an OEM-style replacement and standard fitment collet for ER20 series collet chucks and compatible toolholding systems.

Installation Notes

Installation is performed by a machinist or tool room technician. Always ensure the spindle or collet chuck is fully de-energized and at a complete stop before inserting or removing the collet. Inspect the collet bore, nut, and chuck taper for debris or damage before seating the collet. Use a properly rated ER collet wrench and torque nut to secure the assembly - do not use makeshift tools that can damage the collet or nut seating surfaces.