Kennametal 1026381 CAT40 End Mill Holder 5/8 Inch

Product Description

The KENNAMETAL 1026381 is a CAT40 taper shank end mill holder designed for CNC machining centers that require a secure, high-precision tool interface. The holder accepts a 5/8-inch bore and features through-coolant capability with coolant delivered through the spindle directly to the cutting zone. With a projection of 1.75 inches and a nose diameter of 1.75 inches, the 1026381 provides rigid tool engagement and consistent runout performance. It is balanced to 12,000 RPM, making it suitable for high-speed milling applications in production and job shop environments. The drawbar thread is 5/8-11, conforming to standard CAT40 specifications. Installation and tool changes are handled by CNC machinists and toolroom technicians.

This end mill holder is used in vertical and horizontal CNC machining centers equipped with a CAT40 spindle interface. It is appropriate for both roughing and finishing operations where through-spindle coolant delivery is required to extend tool life and manage chip evacuation. The 1026381 suits applications in ferrous and non-ferrous material cutting where controlled projection and a rigid nose diameter are priorities. Overall length of 4.437 inches fits within standard CAT40 gage-line envelopes common to production machining setups.

Key Features

• CAT40 taper shank for direct compatibility with standard CAT40 spindle interfaces
• 5/8-inch bore accepts standard end mill shanks with a clamping depth of 3.56 inches
• Through-spindle coolant delivery channels coolant directly to the tool tip
• Balanced to 12,000 RPM for stable high-speed milling performance
• 1.75-inch projection and 1.75-inch nose diameter provide rigid, low-overhang tool engagement
• 5/8-11 drawbar thread conforms to CAT40 tooling standards

Compatibility

Designed as an OEM-style replacement and standard fitment for CNC machining centers with a CAT40 spindle taper interface accepting a 5/8-11 drawbar thread.

Installation Notes

Installation is performed by a CNC machinist or toolroom technician. Power down and lock out the machining center spindle before mounting or removing any tool holder. Verify drawbar engagement and torque using the machine manufacturer guidelines for CAT40 holders. Inspect the taper shank and spindle bore for contamination or damage before seating the holder to ensure proper runout and balance at operating RPM.