Kennametal 3026657 Hydraulic Chuck Sleeve 12mm Id Steel

Product Description

The KENNAMETAL 3026657 is a slotted hydraulic chuck sleeve designed to adapt tool shanks within hydraulic toolholding systems used in CNC machining operations. With a 12 mm inside diameter and a 20 mm outside diameter, this sleeve fits into hydraulic chucks to reduce bore size and securely clamp smaller-diameter cutting tools. The 25 mm head diameter provides positive axial stop seating. Built from steel and rated to 1500 psi operating pressure, it supports coolant-through delivery to direct cutting fluid directly to the tool tip. Machining technicians and CNC setup personnel install this part during tool assembly and changeover on milling and drilling centers.

This sleeve is suited for use in hydraulic chuck toolholders on CNC machining centers and milling machines where a 12 mm shank tool must be held in a 20 mm bore hydraulic chuck. The coolant-through design supports high-pressure internal coolant systems, making it appropriate for deep-hole drilling, reaming, and high-speed milling applications where flood coolant at the cutting zone is critical. The 1.969-inch length under head accommodates standard reach requirements in most horizontal and vertical machining center setups.

Key Features

• Slotted sleeve design for secure clamping in hydraulic chuck toolholders
• 12 mm inside diameter accepts standard 12 mm shank cutting tools
• Coolant-through capable at up to 1500 psi for direct cutting fluid delivery
• Steel construction for strength and dimensional stability under clamping load
• 25 mm head diameter provides a positive axial stop against the chuck face
• 1.969 inches length under head for standard reach in CNC toolholder assemblies

Compatibility

Designed for use with hydraulic chuck toolholders requiring a 20 mm bore and 25 mm head diameter sleeve to accept 12 mm shank tools. Verify chuck manufacturer specifications for sleeve OD and head diameter tolerances before installation.

Installation Notes

Installation is performed by qualified CNC machinists or toolroom technicians during tool assembly. The machine spindle must be stopped and the toolholder removed from the spindle before inserting or removing the sleeve. Clean the chuck bore and sleeve OD thoroughly before assembly to ensure proper clamping force and runout performance. Do not exceed the rated clamping pressure of the hydraulic chuck when this sleeve is installed.