Techniks 04220-12.5 ER20 Collet 12.5mm

Product Description

The TECHNIKS 04220-12.5 is an ER20 series collet designed for precision workholding in CNC machining centers, milling machines, and high-speed spindle applications. It holds a 12.5mm bore size and delivers a total indicator runout (TIR) of 0.0002 inches (0.005mm), making it suitable for applications where concentricity directly affects surface finish and tool life. The collet features through-coolant capability, allowing cutting fluid to pass directly through the spindle to the cutting tool. Machinists and CNC setup technicians install this collet as part of an ER20 collet chuck system.

This collet is used in production and job-shop machining environments where repeatable tool runout is critical. It fits standard ER20 collet chucks and is appropriate for milling, drilling, reaming, and tapping operations that require a 12.5mm clamping diameter. Through-coolant support makes it well-suited for deep-hole drilling and high-feed milling where direct coolant delivery extends tool life and clears chips from the cut zone.

Key Features

• ER20 collet series for use with standard ER20 collet chucks
• 12.5mm clamping bore for matching shank diameter tooling
• TIR of 0.0002 inches (0.005mm) for high-precision concentricity
• Through-coolant capable, supporting direct spindle coolant delivery
• Compact design suitable for high-speed spindle applications

Compatibility

Designed as an OEM-style replacement or direct-fit collet for ER20 collet chuck systems accepting 12.5mm bore collets.

Installation Notes

Installation is performed by qualified machinists or CNC setup technicians. Power down and lock out the spindle drive before inserting or removing the collet. Seat the collet fully into the collet nut before threading the nut onto the chuck body, and inspect the collet bore and chuck taper for chips or debris prior to installation. Torque the collet nut using a proper ER spanner wrench to ensure correct clamping force and to protect the collet seating surface.