Accupro 785047 ER40 Collet 0.688 Inches

Product Description

The ACCUPRO 785047 is an ER40 series collet designed for use in CNC machining centers, milling machines, and manual machine tool spindles. It accepts tooling with a decimal inch size of 0.688 inches and a minimum collet capacity of 0.656 inches, giving the operator a defined clamping range suitable for end mills, drills, reamers, and similar round-shank cutting tools. The collet follows the standard ER40 taper geometry, allowing it to seat in any ER40-compatible collet chuck or toolholder. Machinists and tool-and-die professionals install this type of collet as a direct component of the workholding system.

This collet is suited for production and job-shop environments where ER40 toolholding systems are already in use. It fits standard ER40 collet chucks found on vertical and horizontal machining centers as well as knee mills and manual lathes with appropriate spindle adapters. The 0.688-inch size accommodates common imperial shank tooling used in general metalworking, aerospace component work, and precision machining applications. Single-piece packaging makes it straightforward to add to an existing collet set.

Key Features

• ER40 collet series for use with ER40-compatible chucks and toolholders
• 0.688-inch decimal inch collet size with a minimum capacity of 0.656 inches
• Standard ER40 taper geometry ensures reliable seating and repeatable runout
• Compact form factor: 1.75 inches wide and 2 inches tall
• Lightweight at 0.6 pounds for easy handling during tool changes

Compatibility

Designed for use with ER40-series collet chucks and toolholders that accept the standard ER40 taper. Specific machine and chuck compatibility depends on the toolholder installed in the spindle.

Installation Notes

Installation is performed by a machinist or tool technician. Power down and lock out the machine spindle before inserting or removing collets. Use the appropriate ER40 collet nut and a calibrated torque wrench or spanner to seat the collet properly in the chuck body. Inspect the collet bore and chuck taper for chips or debris before assembly to maintain runout accuracy.