Sandvik Coromant 6255474 Hydraulic Tool Chuck C4 12mm

Product Description

The SANDVIK COROMANT 6255474 is a hydraulic tool chuck designed for precision machining applications requiring secure tool clamping and through-coolant delivery. Built with a C4 modular connection shank, this chuck accepts tools with a 12 mm bore diameter (0.4724 inches) and delivers a 185 mm projection from the connection face. The nose diameter measures 22 mm (0.8661 inches), and the overall installed length reaches 209 mm (8.2284 inches). Hydraulic clamping technology provides uniform radial gripping force around the tool shank, reducing runout and improving surface finish consistency during milling, drilling, and boring operations. Licensed machinists and CNC setup technicians install this chuck in machining centers equipped with the C4 Coromant Capto interface.

This hydraulic chuck is suited for CNC machining centers and turning centers running the C4 Coromant Capto modular tooling platform. The 185 mm projection makes it well matched for deep-reach applications where standard-length holders cannot access the workpiece. Through-coolant capability channels cutting fluid directly to the cutting edge, supporting high-speed and hard-material cutting strategies. Typical installations occur in production shops and job shops running high-precision steel, stainless, and exotic alloy components where tool runout and thermal management are critical process variables.

Key Features

• C4 Coromant Capto modular connection for repeatable shank indexing and high torque transfer
• 12 mm bore diameter (0.4724 inches) for standard shank tooling
• 185 mm projection for extended-reach machining scenarios
• Through-coolant passage delivers cutting fluid directly to the tool tip
• 22 mm nose diameter (0.8661 inches) minimizes interference in confined workpiece features
• Hydraulic clamping mechanism provides consistent, low-runout tool grip

Compatibility

Designed for use with C4 Coromant Capto modular tooling interfaces on compatible CNC machining and turning centers. Accepts straight-shank tools with a 12 mm shank diameter.

Installation Notes

Installation should be performed by a qualified machinist or CNC tooling technician. Before mounting or removing the chuck, confirm the machine spindle is fully stopped and the control is in a safe state. Use the appropriate Coromant Capto clamping unit and torque procedure specified by the machine tool builder for C4 connections. Verify through-coolant port alignment with the machine spindle coolant supply before running the spindle.