Techniks 04208-03.5 ER8 Collet 3.50mm

Product Description

The TECHNIKS 04208-03.5 is an ER8 series collet designed for precision workholding in CNC machining and toolholding applications. Built to accept a 3.50mm collet size, this collet delivers a total indicator runout (TIR) of 0.0050mm, making it suitable for high-accuracy work where concentricity matters. Through-coolant capability allows cutting fluid to pass directly through the collet, supporting effective chip evacuation and tool cooling during machining operations. Machinists and CNC operators install this collet into compatible ER8 collet chucks as part of standard toolholding setups.

This collet is suited for use in CNC milling, drilling, and high-speed machining environments where tight tolerances are required. The ER8 series is a compact collet format typically found in smaller-diameter toolholding systems. Through-coolant support makes it a practical choice for applications involving deep-hole drilling or extended-reach tooling where heat and chip buildup are concerns.

Key Features

• ER8 collet series for use in compatible ER8 collet chucks
• 3.50mm collet size for precise tool gripping
• TIR of 0.0050mm for high concentricity and accuracy
• Through-coolant capable for improved chip evacuation and tool life
• Compact ER8 format suited to small-diameter toolholding setups

Compatibility

Designed as a standard ER8 collet replacement for use in ER8-compatible collet chucks and toolholding systems.

Installation Notes

Installation is performed by qualified machinists or CNC setup technicians. Ensure the collet chuck and spindle are fully powered down and at rest before inserting or removing the collet. Clean the collet bore and chuck taper thoroughly before seating to maintain TIR performance. Follow the machine tool manufacturer torque guidelines for the collet nut during installation.