Accupro 587527 ER40 Collet 0.984 Inch 25mm

Product Description

The ACCUPRO 587527 is an ER40 series collet designed for use in CNC machining centers, manual milling machines, and other rotating spindle applications that accept ER40 toolholders. The collet has a nominal size of 0.984 inches (25.00 mm) with a minimum collet capacity of 0.944 inches (24.0 mm), allowing it to grip a range of tool shank diameters within that span. Total Indicated Runout (TIR) is rated at 0.01 mm, providing the concentricity needed for precise material removal and extended tool life. Machinists, toolroom technicians, and CNC setup personnel are the primary users of this collet in production and job-shop environments.

This collet is suited for both production CNC operations and manual toolroom work wherever an ER40 collet chuck is installed. Common applications include end milling, drilling, reaming, and tapping with shanks in the 0.944 to 0.984 inch range. The ER40 series is widely used in medium-to-large spindle setups across general machining, aerospace, and mold-and-die work. The 0.01 mm TIR rating makes it appropriate for finishing passes and precision boring operations where concentricity directly affects part tolerance.

Key Features

• ER40 collet series with 0.984 inch (25.00 mm) nominal collet size
• Minimum collet capacity of 0.944 inches (24.0 mm) for a gripping range within the collet
• 0.01 mm Total Indicated Runout (TIR) for precise concentricity
• Compatible with any ER40-standard collet chuck or toolholder
• Sold individually — one collet per package

Compatibility

Designed for use with ER40-standard collet chucks and toolholders. Fits any spindle or toolholder manufactured to the ER40 collet standard.

Installation Notes

Installation should be performed by a qualified machinist or toolroom technician with the spindle fully stopped and the machine in a locked-out, tagged-out state per applicable safety procedures. Clean the collet, collet nut, and chuck bore thoroughly before seating to prevent runout caused by debris. Do not exceed the collet gripping range when selecting tool shanks, as over-stressing the collet can cause premature wear or loss of concentricity. Inspect the collet seating surface and nut threads regularly as part of routine tooling maintenance.