Techniks 04547-27/64 ER40 Collet 27/64 Inch

Product Description

The TECHNIKS 04547-27/64 is an ER40 collet designed for precision workholding in CNC machining and manual milling applications. Built to the ER40 collet series standard, it accepts a 27/64 inch (0.4219 inch decimal) shank diameter and delivers a total indicator runout (TIR) of 0.0002 inches, making it suitable for close-tolerance drilling, reaming, and light milling work. The collet also supports through-coolant delivery, allowing cutting fluid to reach the tool tip directly for improved chip evacuation and tool life in production environments. Licensed machinists and CNC setup technicians are the primary installers.

This ER40 collet fits ER40-style collet chucks mounted in CNC machining centers, CNC lathes with live tooling, manual knee mills, and similar machine tool spindles. It is well suited for production shops running coolant-fed drilling or reaming operations where runout control and consistent clamping force are critical. The 27/64 inch capacity targets tooling sized for letter and fractional drill series work near the mid-range of the ER40 clamping envelope.

Key Features

• ER40 collet series - fits all standard ER40 collet chucks
• 27/64 inch (0.4219 inch) clamping diameter
• 0.0002 inch TIR for close-tolerance machining
• Through-coolant capable for direct tool-tip fluid delivery
• Lightweight at 0.5 pounds for easy handling during toolchanges

Compatibility

Designed for use with standard ER40 collet chucks across CNC machining centers, live-tooling lathes, and manual milling machines that accept the ER40 collet series.

Installation Notes

Installation is performed by qualified machinists or CNC setup technicians. Power down and lock out the machine spindle before seating or removing any collet. Use the correct ER40 spanner wrench and collet nut torqued per the chuck manufacturer's specification - do not use makeshift tools that can damage the collet taper or nut threads. Inspect the collet bore and chuck taper for chips or debris before assembly to maintain rated TIR.