Techniks 04220-05.5 ER20 Collet 5.50mm Through Coolant

Product Description

The TECHNIKS 04220-05.5 is an ER20 series collet designed for precision tool holding in CNC machining and milling applications. With a 5.50mm collet size and a Total Indicator Runout (TIR) of 0.0002 inches (0.0050mm), this collet delivers the tight tolerances required for high-accuracy cutting operations. Through coolant capability allows coolant to flow directly to the cutting tool, improving chip evacuation and extending tool life. The overall length measures 1.24 inches with a corresponding overall diameter suited to ER20 collet chuck systems. Machinists and tool crib technicians working in production or job shop environments are the primary users of this component.

This collet is used in ER20-compatible collet chucks mounted on CNC machining centers, knee mills, and manual milling machines. It is suited for both roughing and finishing operations where precise tool concentricity is critical. The through coolant feature makes it a practical choice for deep-pocket milling, drilling, and reaming where flood coolant alone cannot reach the cutting zone effectively.

Key Features

• ER20 collet series for broad compatibility with ER20 collet chucks
• 5.50mm collet size for metric tooling
• TIR of 0.0002 inches (0.0050mm) for high-precision runout control
• Through coolant design directs fluid to the cutting edge
• Compact 1.24-inch overall length fits standard ER20 chuck bodies

Compatibility

Designed as an OEM-style replacement and standard fitment collet for ER20 collet chuck systems accepting 5.50mm metric tooling.

Installation Notes

Installation is performed by qualified machinists or toolroom technicians. Before installing or removing the collet, ensure the machine spindle is fully stopped and locked out per shop safety procedures. Insert the collet into the ER20 collet nut before threading onto the chuck body - never thread the nut onto the chuck with the collet already seated in the chuck. Use a calibrated torque wrench and the appropriate ER20 spanner nut wrench to achieve proper clamping force without over-torquing.