Accupro 587523 ER40 Collet 0.826 Inch Machining

Product Description

The ACCUPRO 587523 is an ER40 series collet designed for precision CNC machining and milling applications. With a collet size of 0.826 inches (21.00 mm) and a minimum collet capacity of 0.787 inches (20.0 mm), this collet accommodates a range of tool shank diameters within that window. The total indicated runout (TIR) is rated at 0.01 mm, providing the tight concentricity required for accurate material removal and extended tool life. This collet is installed by machinists and CNC technicians working with ER40-compatible spindles and tool holders in production and job-shop environments.

The ACCUPRO 587523 is suited for use in ER40 collet chucks mounted on CNC mills, machining centers, lathes, and manual milling machines. The ER40 series is one of the most widely used collet standards in general-purpose machining, making this collet a practical fit for shops running a broad variety of end mills, drills, reamers, and taps within the supported shank diameter range. It is sold individually, making it easy to stock specific sizes as needed.

Key Features

• ER40 collet series for broad compatibility with standard ER40 chucks
• Collet size of 0.826 inches (21.00 mm) with a minimum capacity of 0.787 inches (20.0 mm)
• 0.01 mm TIR for high concentricity and repeatable tool positioning
• Sold individually — package quantity of 1

Compatibility

Designed for use with ER40-standard collet chucks and tool holders. Specific machine or chuck model compatibility was not provided in the product data; verify the ER40 chuck specification on your spindle or holder before installation.

Installation Notes

ER40 collets are installed by machinists and CNC technicians using an ER40-compatible collet chuck and the appropriate spanner nut wrench. Always ensure the spindle is fully stopped and the machine is powered down before changing collets. Inspect the collet bore and chuck taper for chips, nicks, or contamination before seating the collet, as debris will increase runout beyond the rated TIR. Do not exceed the collet clamping range when selecting tool shanks.