Sandvik Coromant 5721242 ER20 Collet Chuck CAT40

Product Description

The SANDVIK COROMANT 5721242 is an ER20 collet chuck designed for CNC machining centers using a CAT40 taper shank interface. It accepts ER20-series collets and delivers a 4.12-inch projection from the gauge line, giving machinists reach into deeper workpiece features without sacrificing rigidity. The chuck is balanced to 18,000 RPM, making it suitable for high-speed spindle applications where vibration control directly affects surface finish and tool life. Through-coolant capability routes cutting fluid directly to the tool tip, supporting extended cutting cycles in ferrous and non-ferrous materials. Actuation is by wrench. Licensed machinists and CNC setup technicians are the primary installers.

This collet chuck is used in production and job-shop environments where a CAT40-spindle machining center requires an ER20 collet holding solution. Typical applications include drilling, reaming, tapping, and light milling operations where the ER20 collet range meets the required tool shank diameter. The 4.12-inch projection suits setups where fixture geometry or part depth demands additional clearance between the spindle nose and the cutting zone.

Key Features

• ER20 collet system accepts the full ER20 collet range for flexible tool diameter selection
• CAT40 taper shank provides a standard, widely compatible machine spindle interface
• Balanced to 18,000 RPM for high-speed machining with reduced vibration
• Through-coolant design directs cutting fluid to the tool tip for improved chip evacuation and tool life
• 4.12-inch projection accommodates deep-reach setups and fixture clearance requirements
• Wrench actuation for straightforward collet clamping and release

Compatibility

Designed for use in CAT40-spindle CNC machining centers that accept ER20 collet toolholders. Compatible with the full range of ER20 collets.

Installation Notes

Installation should be performed by a qualified CNC machinist or toolroom technician. Power down and lock out the machine spindle before mounting or removing the chuck. Ensure the CAT40 taper and spindle bore are clean and free of chips or burrs before seating the holder. Torque the drawbar to the machining center manufacturer's specification using a calibrated torque wrench — do not over-tighten or impact-drive the drawbar without guidance from the machine OEM documentation.