Schunk 217925 Hydraulic Chuck Sleeve 8mm Id 20mm Od

Product Description

The SCHUNK 217925 is a steel hydraulic chuck sleeve designed for use with hydraulic toolholding chucks in precision machining applications. The sleeve fits inside the chuck body to adapt the bore to a specific tool shank diameter, enabling secure clamping with the hydraulic expansion mechanism. It measures 8 mm (0.3150 inches) inside diameter and 20 mm (0.7870 inches) outside diameter, with a head diameter of 24 mm and a length under head of 50.50 mm (1.9882 inches). Weighing 0.44 pounds, this steel sleeve is a direct replacement component for worn or damaged sleeves in existing hydraulic chuck assemblies.

This sleeve is suited for CNC machining centers, milling machines, and turning centers where hydraulic chucks are used for high-precision tool clamping. It is typically installed during scheduled toolholder maintenance or when converting a hydraulic chuck to accommodate a different tool shank size. The 8 mm bore makes it appropriate for small-diameter end mills, drills, and reamers commonly used in finish milling and boring operations. Installation is performed by machine tool technicians and toolroom specialists in both job shop and production manufacturing environments.

Key Features

• 8 mm (0.3150 inches) inside diameter for small-shank tooling compatibility
• 20 mm (0.7870 inches) outside diameter fits standard hydraulic chuck bore
• 24 mm head diameter provides positive axial seating inside the chuck body
• 50.50 mm (1.9882 inches) length under head for correct tool projection
• Steel construction for durability under hydraulic clamping pressure
• No through-coolant bore - solid sleeve design

Compatibility

Designed as an OEM-style replacement sleeve for SCHUNK hydraulic chuck assemblies requiring an 8 mm ID reduction sleeve with a 20 mm OD.

Installation Notes

Installation of this sleeve should be performed by a qualified machine tool technician or toolroom specialist. Before servicing the hydraulic chuck, ensure the machine spindle is fully stopped, locked out, and all hydraulic pressure in the chuck is fully released per the toolholder manufacturer's service procedure. The sleeve should be pressed or slid into the chuck bore without impact tools that could damage the precision bore surfaces. Verify proper seating against the head shoulder before applying clamping pressure.