Sandvik Coromant 6255548 Hydraulic Tool Chuck CAT40

Product Description

The SANDVIK COROMANT 6255548 is a hydraulic tool chuck designed for CNC machining centers using a CAT40 taper shank interface. It uses hydraulic clamping to grip cutting tools with a 20 mm bore diameter, delivering high radial rigidity and vibration damping during milling, reaming, and boring operations. The chuck projects 90 mm from the spindle face and has a nose diameter of 38 mm. Through-coolant capability directs cutting fluid directly to the tool tip, supporting higher cutting speeds and longer tool life. This chuck is balanced to 18,000 RPM, making it suited for high-speed machining applications where runout control and balance are critical.

This hydraulic chuck is used in production and job-shop environments running vertical or horizontal machining centers with CAT40 spindles. Typical applications include finish milling, precision boring, and reaming where tool runout must be minimized. The 90 mm projection and 38 mm nose diameter suit reach-intensive setups and confined-cavity work. It is installed and serviced by CNC machinists and tooling specialists in metalworking shops handling aerospace, automotive, die-mold, and general precision components.

Key Features

• CAT40 taper shank for direct spindle mounting on compatible machining centers
• 20 mm (0.7874 inch) hydraulic bore for secure, concentric tool clamping
• Balanced to 18,000 RPM for high-speed spindle applications
• Through-coolant design directs fluid to the cutting zone
• 90 mm projection with 38 mm nose diameter for reach into confined features
• Overall length of 158.4 mm (6.236 inches) for consistent gage-line offsets

Compatibility

Designed for use with CAT40 spindle interfaces on vertical and horizontal machining centers accepting a 20 mm hydraulic bore toolholder. Specific machine compatibility should be confirmed against the spindle taper standard and drawbar pull specification of the machine in use.

Installation Notes

Installation and removal of this toolholder must be performed with the machine spindle powered down and all motion axes at rest. Use a properly calibrated torque wrench and the correct pull-stud torque specification for the spindle make and model — do not estimate pull-stud preload. Through-coolant connections should be inspected for seal condition before assembly. Hydraulic expansion chucks require no additional clamping tools at the bore, but the clamping port should be torqued only with the manufacturer-specified hex key and procedure.