Techniks 04211-03.5 ER11 Collet 3.50mm

Product Description

The TECHNIKS 04211-03.5 is an ER11 series collet designed for use in CNC machining centers, milling machines, and high-speed spindle applications. This collet accepts a 3.50mm tool shank and features through-coolant capability, allowing coolant to flow directly to the cutting zone for improved chip evacuation and tool life. It holds a total indicator runout (TIR) of 0.0050mm, making it suitable for precision work where concentricity matters. Machinists and CNC operators install this collet into compatible ER11 collet chucks or toolholders as part of standard tooling setups.

This collet is used in light-duty to medium-duty CNC milling, drilling, and high-speed machining operations where small-diameter tooling is required. The ER11 series is a widely adopted standard in production and job-shop environments. The through-coolant feature makes it particularly well suited for deep-hole drilling and applications where direct coolant delivery improves process reliability. It is installed and changed out by machinists and CNC tooling technicians during routine tooling changes or setup.

Key Features

• ER11 collet series for use with ER11-compatible chucks and toolholders
• 3.50mm collet size for small-diameter tool shanks
• Through-coolant design directs fluid to the cutting edge
• TIR of 0.0050mm for high concentricity and precision machining
• Lightweight at 0.03 pounds for minimal spindle load contribution

Compatibility

Designed as a standard ER11 series collet for use with any ER11-compatible collet chuck or toolholder meeting the ER11 collet interface specification.

Installation Notes

Installation should be performed by a qualified machinist or CNC tooling technician. Ensure the spindle is fully powered down and the machine is in a safe state before changing collets. Clean the collet seat and chuck bore before installation to maintain runout accuracy. Do not overtighten the collet nut beyond the chuck manufacturer's specified torque range, and inspect the collet for wear or damage before each use.