Sandvik Coromant 6766859 Hydraulic Chuck Sleeve

Product Description

The SANDVIK COROMANT 6766859 is a slotted hydraulic chuck sleeve designed to adapt tooling within hydraulic chucks used in CNC machining centers and precision boring applications. It features a 6 mm inside diameter, a 12 mm outside diameter, and a 16 mm head diameter, with a length under head of 1.5748 inches (40 mm). Manufactured from steel, this sleeve supports coolant-through delivery, making it suitable for deep-bore and high-heat cutting operations. It is installed by machinists and toolroom technicians who require precise, repeatable tool positioning within hydraulic clamping systems.

This sleeve fits hydraulic chuck bodies where a 6 mm bore reduction is needed within a 12 mm chuck bore. The slotted design allows for proper coolant flow and pressure distribution during cutting. Typical applications include precision drilling, reaming, and finish boring on production CNC equipment. The coolant-through capability supports chip evacuation and tool life in ferrous and non-ferrous machining environments. The steel construction provides the dimensional stability required for tight-tolerance work in both job shop and high-volume production settings.

Key Features

• Slotted sleeve design supports coolant-through delivery at rated pressure
• 6 mm inside diameter with 12 mm outside diameter for precise bore reduction within hydraulic chuck bodies
• 16 mm head diameter provides positive axial seating and registration
• Steel construction for dimensional stability under clamping load and thermal cycling
• Length under head of 1.5748 inches (40 mm) suits standard hydraulic chuck depth ranges
• Package quantity of 1 — sold as individual component

Compatibility

Designed as an OEM-style reduction sleeve for hydraulic chuck bodies accepting a 12 mm outside diameter sleeve with a 6 mm bore. Consult your hydraulic chuck manufacturer specifications to confirm sleeve fitment before installation.

Installation Notes

Installation should be performed by a qualified machinist or toolroom technician familiar with hydraulic chuck systems. Ensure the machine spindle is fully stopped and the hydraulic chuck is depressurized before inserting or removing the sleeve. Clean the chuck bore and sleeve exterior thoroughly to remove chips, coolant residue, and debris that could affect seating and concentricity. Do not force the sleeve into the chuck bore; confirm inside and outside diameter compatibility with the chuck body specification before assembly.