Accupro 784907 ER20 Collet 1/2 Inch

Product Description

The ACCUPRO 784907 is an ER20 series collet designed for use in CNC machining centers, milling machines, and other rotating spindle equipment that accepts ER20 toolholders. It holds tool shanks at a nominal size of 0.5 inches (1/2 inch) with a minimum collet capacity of 0.469 inches, providing a secure, concentric grip on end mills, drills, reamers, and similar round-shank cutting tools. Machinists and tool crib technicians working in job shop and production environments rely on ER-style collets for their repeatable runout performance and broad clamping range. This collet measures 1.9 inches in height and 1.2 inches in diameter and weighs 0.05 pounds.

The ACCUPRO 784907 is suited for general-purpose material removal operations in both manual and CNC spindle applications where an ER20 collet nut and toolholder are already installed. It is a single-piece collet sold individually and fits any standard ER20-compliant toolholder. Typical users include machinists, tool and die makers, and maintenance technicians running knee mills, vertical machining centers, or high-speed routers equipped with ER20 collet chucks.

Key Features

• ER20 collet series — fits any ER20-compliant toolholder and collet nut
• 0.5 inch (1/2 inch) nominal collet size with 0.469 inch minimum capacity
• Compact profile: 1.9 inches tall, 1.2 inches in diameter
• Lightweight at 0.05 pounds — minimal spindle load contribution
• Sold individually (quantity of 1 per package)

Compatibility

Designed as a direct-fit replacement or spare for any ER20-standard collet chuck or toolholder requiring a 1/2 inch collet. No specific OEM model compatibility was stated in the product data.

Installation Notes

Installation is performed by qualified machinists or toolroom technicians. Always power down and lock out the spindle drive before inserting or removing a collet from the toolholder. Seat the collet fully into the collet nut before threading the nut onto the toolholder body, and torque the collet nut using a calibrated ER collet wrench to the toolholder manufacturer's specification. Inspect the collet bore and toolholder taper for chips or contamination before each use to maintain runout accuracy.