Sandvik Coromant 6255551 Hydraulic Chuck CAT40

Product Description

The SANDVIK COROMANT 6255551 is a hydraulic tool chuck designed for precision CNC machining applications. It features a CAT40 taper shank interface and accepts tooling with a 12 mm (0.4724 inch) bore diameter. The hydraulic clamping mechanism delivers concentric grip force without set screws, reducing runout and improving surface finish compared to standard end mill holders. With an overall length of 206.40 mm (8.126 inches) and a 138 mm projection, this chuck suits deep-reach setups where rigidity and vibration damping are critical. Licensed machinists and CNC tooling specialists handle installation and tooling changes.

This hydraulic chuck is suited for milling, drilling, and reaming operations on vertical and horizontal machining centers equipped with CAT40 spindle interfaces. The 22 mm nose diameter and 138 mm projection make it well-suited for operations requiring reach into deep pockets or around part features. Through-coolant capability directs coolant directly to the cutting edge, supporting higher feed rates and extended tool life in production environments. The 18,000 RPM balanced rating supports high-speed machining strategies on modern VMCs and HMCs.

Key Features

• CAT40 taper shank for direct spindle mounting on standard machining centers
• Hydraulic clamping mechanism minimizes runout for improved surface finish and tool life
• Balanced to 18,000 RPM for high-speed machining compatibility
• Through-coolant capable to deliver cutting fluid directly to the tool tip
• 12 mm bore diameter with 36 mm (1.4173 inch) clamping depth for secure tool grip
• 22 mm nose diameter supports reach into tight or deep workpiece features

Compatibility

Designed for use in CAT40 spindle machining centers. Accepts shank tooling with a 12 mm diameter. Verify spindle interface and tool shank diameter before installation.

Installation Notes

Installation and tool changes should be performed by qualified CNC tooling technicians following the machine tool builder guidelines. Power down and lock out the machining center spindle before handling any tooling or chuck components. Use a calibrated torque wrench and the appropriate pull stud when mounting to the spindle to ensure proper seating of the CAT40 taper. Do not exceed the rated 18,000 RPM balanced speed during operation.