Techniks 04225-03.5 ER25 Collet 3.50mm

Product Description

The TECHNIKS 04225-03.5 is an ER25 series collet designed for precision tool holding in CNC machining centers, milling machines, and other rotating spindle applications. Sized at 3.50mm, it delivers a total indicator runout (TIR) of 0.0002 inches (0.0050mm), making it suitable for close-tolerance work where tool concentricity directly affects surface finish and tool life. Through-coolant capability allows cutting fluid to be delivered directly to the cutting zone, supporting higher feed rates and extended tool life in demanding machining operations. At 0.5 pounds, it is a standard shop weight for this collet series. Installation and replacement are handled by machinists and CNC setup technicians.

This ER25 collet is used in any spindle or toolholder that accepts the ER25 collet standard, one of the most widely adopted collet systems in CNC and manual machining environments. Typical applications include end milling, drilling, reaming, and tapping in both ferrous and non-ferrous materials. The through-coolant design makes it well suited for deep-hole drilling, high-speed milling, and other operations where flood coolant alone is insufficient to evacuate chips or control heat at the cutting edge.

Key Features

• ER25 collet series - compatible with the widely adopted ER25 standard spindle interface
• 3.50mm collet bore size for precise tool shank grip
• TIR of 0.0002 inches (0.0050mm) for close-tolerance concentricity
• Through-coolant design routes cutting fluid directly to the tool tip
• Lightweight at 0.5 pounds for quick changeover

Compatibility

Designed for use with ER25-compatible collet chucks and toolholders that support the ER25 collet standard.

Installation Notes

ER collets are installed and serviced by machinists or CNC setup technicians. Always de-energize and lock out the machine spindle before changing collets. Use the correct ER25 spanner nut and torque wrench rated for this collet series - do not over-tighten or use improvised tools, as this can distort the collet and degrade runout performance. Verify TIR with a dial indicator after seating the collet and tool shank before resuming production cuts.