Accupro 771060 CAT40 End Mill Holder 1-1/4 Inch Through Coolant

Product Description

The ACCUPRO 771060 is a CAT40 dual contact taper shank end mill holder designed for precision milling operations on CNC machining centers. It accepts a 1-1/4 inch bore and delivers a 2 inch projection with a 2-1/4 inch nose diameter. Through-coolant capability routes fluid directly through the spindle to the cutting edge, reducing heat and improving chip evacuation. The holder is balanced to 30,000 RPM and holds a TIR of 0.0002 inch, making it suitable for high-speed finishing and general-purpose milling. Retention knob thread size is 5/8-11. Installation is handled by CNC machinists and toolroom technicians.

This end mill holder is intended for use on CNC vertical and horizontal machining centers equipped with a CAT40 dual contact spindle interface. Dual contact taper shank design provides simultaneous taper and flange contact, improving rigidity and repeatability compared to standard single-contact CAT40 holders. It is well suited for operations requiring close tolerances, high spindle speeds, or through-spindle coolant delivery. Typical applications include finish milling, profiling, and high-speed machining of ferrous and non-ferrous materials in production and job shop environments.

Key Features

• CAT40 dual contact taper shank for simultaneous taper and flange engagement
• 1-1/4 inch bore diameter with 2.28 inch clamping depth
• 2 inch projection and 2-1/4 inch nose diameter
• Through-spindle coolant compatible for improved chip control and tool life
• Balanced to 30,000 RPM for high-speed machining applications
• TIR of 0.0002 inch for precision runout control
• 5/8-11 retention knob thread size

Compatibility

Designed for CNC machining centers with a CAT40 dual contact spindle taper interface and through-spindle coolant capability.

Installation Notes

Installation should be performed by a qualified CNC machinist or toolroom technician. Power down and lock out the machine spindle before mounting or removing the holder. Use the correct torque specifications for the retention knob as required by the machine tool manufacturer. Verify TIR at setup using a precision test indicator before production runs.