Kennametal 1025921 CAT40 End Mill Holder 3/16 Inch Through Coolant

Product Description

The KENNAMETAL 1025921 is a CAT40 taper shank end mill holder designed for CNC machining centers requiring precise tool retention and internal coolant delivery. The holder accepts a 3/16 inch bore and features a through-coolant design with coolant delivered directly through the spindle to the cutting tool. With an overall length of 5.187 inches, a projection of 2.5 inches, and a nose diameter of 11/16 inches, this holder is built for applications where reach and rigidity both matter. Balanced to 12,000 RPM, it is suited for high-speed machining operations. A licensed machinist or CNC setup technician is the typical installer.

This end mill holder is used in CNC vertical and horizontal machining centers equipped with a CAT40 spindle interface. It is well suited for production environments running through-spindle coolant systems where tool life and chip evacuation depend on consistent coolant flow directly at the cut zone. The 2.5 inch projection provides clearance for medium-depth workpiece features without sacrificing rigidity. The 5/8-11 drawbar thread is standard for CAT40 tooling systems.

Key Features

• CAT40 taper shank for direct mounting in CAT40-spindle machining centers
• 3/16 inch bore diameter for small-diameter end mill retention
• Through-coolant design with through-spindle coolant delivery to the cutting tool
• Balanced to 12,000 RPM for high-speed machining applications
• 2.5 inch projection with 11/16 inch nose diameter for reach into workpiece features
• 5/8-11 drawbar thread, standard for CAT40 tooling

Compatibility

Designed as an OEM-style replacement or production tooling option for CAT40-spindle CNC machining centers equipped with through-spindle coolant and a 5/8-11 drawbar.

Installation Notes

Installation and tool changes must be performed with the machine spindle fully stopped and locked out per facility lockout/tagout procedures. Use a proper CAT40 tool-tightening fixture and drawbar wrench to achieve secure clamping — never hand-tighten a drawbar. Verify coolant passages are clear before mounting and confirm the end mill shank is seated to the full clamping depth of 4.01 inches for proper retention. A qualified machinist or CNC toolroom technician should handle setup.