Accupro 588501 ER40 Collet 4 Mm Bore

Product Description

The ACCUPRO 588501 is an ER40 series collet designed for use in CNC machining centers, milling machines, and other rotating spindle equipment that accepts ER40 toolholders. This collet features a 4 mm bore size, providing a precise clamping interface for small-diameter cutting tools, drill bits, and end mills. ER-style collets are the industry standard for accurate tool holding in production and job-shop environments. Machinists and CNC operators install this collet into a compatible ER40 nut and holder assembly to secure tooling during cutting operations. The collet is rated to 1000 units of clamping pressure and weighs 0.85 pounds.

This collet is suited for use in horizontal and vertical machining centers, knee mills, and router spindles equipped with ER40 collet chucks. It is appropriate for light to heavy-duty cutting applications where a 4 mm tool shank diameter is required. The ER40 series accommodates a wide range of bore sizes, making it a versatile choice across production and prototype machining operations in metalworking and fabrication shops.

Key Features

• ER40 collet series for compatibility with standard ER40 toolholders and nuts
• 4 mm bore size for precise clamping of small-diameter tooling
• Clamping pressure rating of 1000 for secure tool retention during cutting
• Single-piece package quantity suitable for individual replacement or kit building
• Lightweight at 0.85 pounds for minimal spindle load contribution

Compatibility

Designed as an OEM-style replacement collet for use in any machine spindle or toolholder assembly built to the ER40 collet standard.

Installation Notes

Installation should be performed by a qualified machinist or CNC technician. Power down and lock out the machine spindle before inserting or removing collets. Seat the collet fully into the ER40 nut before threading onto the toolholder, and torque the nut using a proper ER collet wrench rather than pliers or improvised tools to avoid damage to the collet taper. Inspect the collet bore and taper surfaces for wear or contamination before each use.