Value Collection 204-4040 ER40 Collet 0.625 Inch

Product Description

The VALUE COLLECTION 204-4040 is an ER40 series collet designed for use in CNC machining centers, milling machines, and other rotating spindle applications that accept ER40 toolholding systems. This collet holds workpieces or cutting tools with a nominal clamping diameter of 0.625 inches (5/8 inch) and delivers a total indicated runout (TIR) of 0.0005 inches, supporting accurate, repeatable tool positioning. Machinists and toolroom technicians install ER collets as standard consumable toolholding components during setup and toolchange operations.

This collet is suited for production and job-shop environments where ER40 collet chucks are in use. The ER40 series is a widely adopted standard in both manual and CNC milling, drilling, tapping, and grinding applications. The 0.625-inch bore size accommodates straight-shank cutting tools and round stock of that diameter, making it a common selection for end mills, drill bits, and reamers of that size in light to medium-duty machining operations.

Key Features

• ER40 collet series for use with ER40-compatible collet chucks
• 0.625 inch (5/8 inch) clamping diameter for straight-shank tooling
• 0.0005 inch TIR for consistent, repeatable tool runout performance
• Single-piece collet construction standard to ER toolholding systems
• Sold individually — minimum order quantity of 1

Compatibility

Designed as an OEM-style replacement or standard fitment collet for machinery equipped with ER40 collet chuck systems accepting a 0.625-inch bore collet.

Installation Notes

ER collets are installed and removed by a qualified machinist or toolroom technician using the appropriate ER40 collet nut and spanner wrench. The spindle or collet chuck must be fully stopped and the machine powered down before changing collets. Inspect the collet bore and chuck taper for chips or debris before seating the collet to protect TIR accuracy. Follow the machine manufacturer torque guidance for the collet nut as posted in the machine documentation.