Kennametal 1026409 CAT40 End Mill Holder 1/4 Inch Through Coolant

Product Description

The KENNAMETAL 1026409 is a CAT40 taper shank end mill holder designed for CNC machining centers that require secure tool clamping and through-spindle coolant delivery. With a 1/4 inch bore, a 4.5 inch projection, and a 25/32 inch nose diameter, this holder positions end mills at extended reach while maintaining rigidity. The through-coolant design channels cutting fluid directly to the tool tip, improving chip evacuation and extending tool life in demanding milling operations. It is balanced to 12000 RPM, making it suitable for high-speed machining applications. The drawbar thread is 5/8-11, standard for CAT40 spindles.

This end mill holder is used in CNC vertical and horizontal machining centers equipped with CAT40 spindle interfaces. The 4.5 inch projection accommodates deep-reach milling operations such as cavity work, shoulder milling, and contouring where clearance from the spindle nose is required. The through-coolant path supports high-pressure coolant systems common in production and tool room environments. Installation and tool changes are performed by machinists and CNC setup technicians in shop environments.

Key Features

• CAT40 taper shank for direct mounting in CAT40 spindle interfaces
• 1/4 inch bore diameter for standard end mill shanks
• 4.5 inch projection for extended-reach milling applications
• Through-coolant design with through-spindle coolant type for direct fluid delivery to the cutting edge
• Balanced to 12000 RPM for high-speed machining compatibility
• 5/8-11 drawbar thread matching standard CAT40 retention knob specifications
• 6.010 inch clamping depth for secure tool engagement

Compatibility

Designed as an OEM-style replacement and standard fitment for CNC machining centers with CAT40 spindle interfaces requiring a 1/4 inch bore end mill holder with through-spindle coolant capability.

Installation Notes

Installation is performed by qualified machinists or CNC setup technicians. Power down and lock out the machining center before installing or removing the holder from the spindle. Use the correct retention knob torque specification for the machine spindle and verify the drawbar engagement is complete before operation. Inspect the taper shank and spindle bore for chips or contamination prior to seating the holder.