Techniks 04208-04.0 ER8 Collet 4.00mm

Product Description

The TECHNIKS 04208-04.0 is an ER8 series collet designed for use in CNC machining centers, milling machines, and high-speed spindle applications. It accepts a 4.00mm tool shank and features through-coolant capability, allowing coolant to be delivered directly to the cutting zone for improved chip evacuation and tool life. With a total indicator runout (TIR) of 0.0050mm, this collet delivers the concentricity required for precision work. Machinists and CNC operators install this collet into compatible ER8 collet chucks as part of standard toolholding setups.

This collet is suited for light-duty precision machining operations involving small-diameter end mills, drills, reamers, and similar cutting tools with a 4.00mm shank. The ER8 series is commonly used in high-speed spindle units, tool grinding fixtures, and compact machining centers where small-diameter toolholding is required. Through-coolant capability makes it well suited for deep-hole drilling and other operations where direct coolant delivery improves cutting performance.

Key Features

• ER8 collet series for use with compatible ER8 collet chucks
• 4.00mm collet size for precise small-diameter toolholding
• Through-coolant design delivers coolant directly to the cutting edge
• TIR of 0.0050mm for high concentricity and precision runout control
• Compact form factor suited for high-speed spindle and small-machine applications

Compatibility

Designed as an OEM-style replacement or standard toolholding component for use with ER8 series collet chucks in CNC milling, drilling, and grinding applications.

Installation Notes

Installation is performed by qualified machinists or CNC setup technicians. Ensure the collet chuck and spindle are fully de-energized and the machine is in a safe lockout-tagout state before handling toolholding components. Seat the collet fully into the nut before inserting into the chuck body, and use a calibrated torque wrench appropriate for ER8 collet nuts to achieve proper clamping force. Inspect the collet bore and seating surfaces for debris or damage before each use to maintain runout performance.