Accupro 587647 ER8 Collet 4.00mm 0.1574 in

Product Description

The ACCUPRO 587647 is an ER8 series collet designed for precision toolholding in CNC machining and manual milling operations. With a collet size of 4.00mm (0.1574 inches) and a Total Indicator Runout (TIR) of 0.01mm, this collet delivers the concentricity required for small-diameter cutting tools, drill bits, and end mills. The overall length is 13.0mm and the overall diameter is 8.5mm. It is installed by machinists and toolroom technicians working with ER8-compatible collet chucks and spindle holders. The tight TIR specification supports accurate material removal and extended tool life in light-duty precision machining applications.

This collet is suited for use in small CNC machining centers, engraving machines, PCB drilling equipment, and manual milling machines equipped with ER8 collet chucks. It accommodates tools with a minimum collet capacity of 0.1377 inches (3.5mm) up to 4.00mm shank diameter. Typical applications include holding miniature end mills, drill bits, and engraving cutters where precise tool concentricity and repeatable clamping are required.

Key Features

• ER8 collet series for compatibility with standard ER8 collet chucks
• 4.00mm nominal collet size with 0.1574-inch decimal equivalent
• 0.01mm TIR for high concentricity and reduced tool runout
• Minimum collet capacity of 3.5mm (0.1377 inches) for flexible tool clamping range
• Compact 13.0mm overall length suited for tight spindle clearances

Compatibility

Designed as a direct-fit replacement collet for ER8-series collet chucks used in small CNC machining centers, engraving machines, and PCB drilling equipment requiring a 4.00mm tool shank capacity.

Installation Notes

Installation is performed by machinists or toolroom technicians. Before installing or removing collets, ensure the spindle is fully stopped and all machine power is off or in an e-stop state. Use the appropriate ER8 collet nut and torque wrench rated for ER collet systems — do not over-tighten by hand without proper tooling. Inspect the collet bore and seating surface for chips or debris before seating to maintain TIR performance.