Techniks 04225-08 ER25 Collet 8mm Through Coolant

Product Description

The TECHNIKS 04225-08 is an ER25 series collet designed for use in CNC machining centers, milling machines, and other spindle-driven equipment that accept the ER25 collet standard. This collet clamps an 8mm tool shank and delivers a Total Indicator Runout (TIR) of 0.0002 inches (0.0050 mm), making it well suited for precision work where concentricity directly affects surface finish and tool life. The through-coolant design allows cutting fluid to pass through the collet to the cutting edge, improving chip evacuation and thermal control during extended cuts. Installation and removal are performed by a licensed machinist or toolroom technician using a standard ER25 collet nut and spanner wrench.

This collet is appropriate for production and job-shop machining environments where ER25 toolholders are already in use. It is a direct-fit collet for any ER25-compatible holder, covering a wide range of vertical and horizontal machining centers. The through-coolant capability makes it particularly useful in deep-pocket milling, drilling, and reaming operations where flood coolant alone cannot adequately reach the cutting zone. It is sized for 8mm shank tooling, including end mills, drills, and reamers ground to that diameter.

Key Features

• ER25 collet series for universal compatibility with ER25 toolholders
• 8mm collet size for direct clamping of 8mm shank tooling
• TIR of 0.0002 inches (0.0050 mm) for precision concentricity
• Through-coolant design channels cutting fluid directly to the tool tip
• Lightweight at 0.5 pounds for easy handling and quick changeouts

Compatibility

Designed as a direct-fit replacement collet for any ER25-standard toolholder used in CNC milling, drilling, or multi-axis machining applications.

Installation Notes

Installation should be performed by a qualified machinist with the spindle fully powered down and locked out. Seat the collet into the collet nut before threading onto the toolholder - never insert the collet into the holder without the nut engaged first. Use a calibrated torque wrench and the appropriate ER25 spanner to achieve proper clamping force; under-torquing can cause tool pullout and over-torquing can deform the collet bore. Inspect the collet bore and seating taper for chips or contamination before each use.