Value Collection 204-4016 ER40 Collet 0.25 in

Product Description

The VALUE COLLECTION 204-4016 is an ER40 series collet designed for use in CNC machining centers, milling machines, and toolholding systems that accept ER40 collet chucks. With a collet size of 0.25 inches (1/4 inch) and a total indicator runout (TIR) of 0.0005 inches, this collet provides the precision grip required for accurate material removal and consistent tool concentricity. Machinists and tool room technicians rely on ER-style collets to secure cutting tools, drills, and end mills during high-speed machining operations. The ER40 designation refers to the collet series, which determines chuck compatibility and clamping range.

This collet is suited for use in production and job-shop environments where repeatable tool holding is required. It fits any standard ER40 collet chuck and is appropriate for securing 0.25-inch shank tooling including end mills, drills, reamers, and taps. The unit is sold individually and is a practical replacement or supplemental collet for shops running multiple setups simultaneously.

Key Features

• ER40 collet series for compatibility with standard ER40 chucks
• 0.25 inch (1/4 inch) collet size for secure grip on matching shank tooling
• 0.0005 inch TIR for precise tool concentricity and reduced runout
• Sold as a single unit — easy to stock as a replacement or spare
• Lightweight at 0.66 pounds for easy handling and quick changeout

Compatibility

Designed for use in ER40 collet chucks used on CNC milling machines, machining centers, and manual mills that accept the ER40 collet series. Compatible with 0.25-inch shank tooling.

Installation Notes

Installation is performed by qualified machinists or tool room technicians. Before changing or seating the collet, ensure the spindle is fully stopped and the machine is powered down or in a safe lockout state. Insert the collet into the ER40 chuck by snapping it into the collet nut before threading the nut onto the chuck body — never tighten the nut without the collet and tool seated properly. Use a calibrated torque wrench and the chuck manufacturer's specified procedure to achieve proper clamping force without damaging the collet.