Schunk 217881 Hydraulic Chuck Sleeve 3/16 in Id Steel

Product Description

The SCHUNK 217881 is a hydraulic chuck sleeve designed to serve as a precision interface between a hydraulic tool holder and a cutting tool shank. Machined from steel, this sleeve allows a hydraulic chuck to grip tool shanks with a 3/16 inch (0.1875 inch) inside diameter bore. The outside diameter measures 0.787 inches, and the length under head is 1.9882 inches. It is installed by toolroom technicians and CNC machine operators as part of a hydraulic clamping system where precise, vibration-damping tool holding is required.

Hydraulic chuck sleeves are used in machining centers, turning centers, and milling applications where a hydraulic chuck body is sized for a larger tool shank bore than the cutting tool being run. This 217881 sleeve fits inside the chuck body and reduces the effective bore to 3/16 inch, extending the range of tools a single hydraulic chuck can accommodate. It is suited to light-to-medium duty cutting operations in both production and job-shop environments.

Key Features

• Steel construction for rigidity and durability in rotating toolholder applications
• Inside diameter of 3/16 inch (0.1875 inch / 4.73 mm) for compatible tool shank sizing
• Outside diameter of 0.787 inches (20.00 mm) for proper seating inside the hydraulic chuck body
• Length under head of 1.9882 inches (50.50 mm) for correct axial positioning
• Head diameter of 24.00 mm provides positive stop against the chuck face
• No through-coolant passage - compatible with standard (non-coolant-through) setups

Compatibility

Designed as an OEM-style replacement sleeve for SCHUNK hydraulic chuck systems requiring a 3/16 inch bore reduction with a 0.787 inch outer diameter seating surface.

Installation Notes

Installation is performed by toolroom technicians or CNC setup personnel. Before installing or removing a hydraulic chuck sleeve, ensure the machine spindle is fully stopped, the tool changer is disabled, and all hydraulic clamping pressure has been released from the chuck body. Use the chuck manufacturer's recommended insertion and extraction procedure to avoid scoring the bore or sleeve surface. Consult the chuck manufacturer's documentation for clamping torque and actuation specifications specific to the chuck model in use.