Accupro 771046 CAT40 End Mill Holder 3/4 Inch Bore

Product Description

The ACCUPRO 771046 is a CAT40 dual contact taper shank end mill holder designed for high-precision CNC machining applications. The dual contact interface engages both the taper and the spindle face simultaneously, increasing rigidity and reducing tool runout. This holder features a 3/4 inch bore, a 5.5 inch projection, and a 1-3/4 inch nose diameter. Total indicator runout (TIR) is rated at 0.0002 inches, making it appropriate for finishing operations where dimensional accuracy is critical. Installed by CNC machinists and toolroom technicians, this holder suits vertical and horizontal machining centers equipped with CAT40 spindles.

This end mill holder is suited for production and job-shop environments running CAT40-spindle VMCs or HMCs. The 5.5 inch projection accommodates setups requiring extended reach, such as deep-pocket milling or workpiece clearance situations. Through-spindle and DIN flange coolant delivery is supported, allowing directed coolant flow to the cutting edge for improved chip evacuation and tool life in ferrous and non-ferrous material cutting. The 5/8-11 retention knob thread is standard for CAT40 tooling drawbar systems.

Key Features

• CAT40 dual contact taper shank engages both taper and face for increased spindle rigidity
• 3/4 inch bore diameter with 1.77 inch clamping depth secures standard end mill shanks
• TIR of 0.0002 inches supports precision finishing and tight-tolerance work
• Through-spindle and DIN flange coolant delivery for active chip and heat management
• Balanced to 30,000 RPM for high-speed machining applications
• 5/8-11 retention knob thread matches standard CAT40 drawbar systems

Compatibility

Designed for CNC machining centers with CAT40 dual contact spindle interfaces. Compatible with 3/4 inch shank end mills and accepts through-spindle coolant supply.

Installation Notes

Installation and tool changes must be performed by qualified CNC machinists or toolroom technicians with the spindle fully powered down and the machine in a safe lockout state. Verify retention knob thread engagement and drawbar torque per the machine tool manufacturer specifications before operation. Confirm coolant port alignment if using through-spindle coolant. Do not exceed the balanced RPM rating of 30,000 RPM during operation.