Accupro 784908 ER20 Collet 0.25 Inch

Product Description

The ACCUPRO 784908 is an ER20 series collet designed to hold cutting tools with a 0.25 inch shank diameter in compatible milling, drilling, and routing spindles. With a minimum collet capacity of 0.234 inches and a nominal holding size of 1/4 inch, it provides a secure, concentric grip on round-shank tooling. The collet measures 1.9 inches in height and 1.2 inches in diameter and weighs 0.05 pounds. It is installed by machinists and CNC operators in machine shop and manufacturing environments where precise tool holding is required.

This ER20 collet is suited for use in ER20-compatible collet chucks found on CNC machining centers, manual milling machines, and high-speed routing spindles. It is appropriate for both production and toolroom applications where repeatable tool runout and consistent gripping force are priorities. Sold individually, it is a direct replacement or spare for any ER20 collet position requiring a 1/4 inch holding size.

Key Features

• ER20 collet series with 0.25 inch nominal holding diameter
• Minimum collet capacity of 0.234 inches accommodates slightly undersized shanks
• Compact form factor: 1.9 inches tall and 1.2 inches in diameter
• Lightweight at 0.05 pounds for easy handling and spindle balance
• Sold as a single unit for targeted replacement or kit building

Compatibility

Designed for use with ER20-compatible collet chucks and spindle holders across standard CNC and manual machine tool platforms.

Installation Notes

Installation is performed by a machinist or CNC operator. Power down and lock out the spindle drive before inserting or removing the collet. Seat the collet fully into the collet nut before threading onto the chuck body, and use the appropriate ER20 spanners or collet wrenches to achieve proper torque. Inspect the collet bore and chuck taper for debris or damage before each use.