Parlec ER11-0250 ER11 Collet 1/4 Inch

Product Description

The PARLEC ER11-0250 is an ER11 series collet designed for precision workholding in CNC machining centers, milling machines, and high-speed spindle applications. It accepts a 0.25 inch (1/4 inch) shank with a minimum collet capacity of 0.211 inches, providing a reliable clamping range suited to small-diameter tooling. The overall length is 0.708 inches and the overall diameter is 0.452 inches. Machinists and CNC setup technicians install this collet into compatible ER11 collet chucks or collet holders to secure end mills, drills, reamers, and other rotary cutting tools during precision machining operations.

This collet is intended for use in ER11 toolholding systems found in compact machining centers, engraving machines, high-speed routing spindles, and light-duty milling setups. The ER11 series is a widely adopted standard in precision machining environments where small-diameter tooling and close-tolerance workholding are required. It is suited for both production shop and toolroom use where repeatable tool runout and secure clamping are critical to part quality.

Key Features

• ER11 series collet standard for broad compatibility with ER11 chucks and holders
• 0.25 inch (1/4 inch) nominal collet size with a minimum capacity of 0.211 inches
• Compact overall length of 0.708 inches suits tight-clearance spindle assemblies
• Overall diameter of 0.452 inches for proper seating in ER11 collet chucks
• Lightweight at 0.03 pounds, minimizing added mass at the spindle nose

Compatibility

Designed as an OEM-style replacement or standard component for use with ER11 series collet chucks and toolholders accepting 1/4 inch shank tooling.

Installation Notes

Installation is performed by qualified machinists or CNC tooling technicians. Always de-energize and lock out the machine spindle before changing collets. Insert the collet into the ER11 collet nut before threading onto the chuck body, and use the appropriate ER11 collet wrench and chuck wrench to torque to the chuck manufacturer's specification. Inspect the collet bore and seating taper for chips or debris before each use to maintain runout accuracy.