Accupro 784821 ER20 Collet 0.278 Inch

Product Description

The ACCUPRO 784821 is an ER20 series collet designed for use in CNC machining centers, milling machines, and other rotating spindle equipment that accepts ER20 toolholders. With a collet size of 0.278 inches and a minimum collet capacity of 0.25 inches, this collet provides a reliable clamping range for straight-shank cutting tools including end mills, drills, and reamers. The overall length measures 1.22 inches. Weighing 0.1 pounds, it is a compact, precision-ground workholding component suited for production and job shop environments. Installation and setup are typically performed by machinists and CNC technicians.

This ER20 collet is used in applications requiring accurate, repeatable tool clamping in ER20-compatible toolholders. It is well suited for light to medium milling, drilling, and reaming operations in both manual and CNC setups. The ER20 series is a widely adopted standard in vertical and horizontal machining centers across residential shop and commercial production environments.

Key Features

• Collet series: ER20, compatible with standard ER20 toolholders
• Collet size: 0.278 inches with a minimum collet capacity of 0.25 inches
• Overall length: 1.22 inches for use in compact and standard ER20 chucks
• Lightweight at 0.1 pounds for easy handling during tool changes
• Packaged quantity of 1 for individual replacement or fleet builds

Compatibility

Designed as an OEM-style replacement or standard addition for use with ER20-series collet chucks and toolholders accepting the ER20 collet standard.

Installation Notes

ER collets are installed and removed by machinists using the appropriate ER20 collet nut and spanner wrench. Always power down and lock out the machine spindle before changing tooling. Ensure the collet, chuck bore, and tool shank are clean and free of chips or coolant buildup before seating the collet. Do not exceed the rated clamping range of the collet when selecting tool shank diameters.