Accupro 775016 CAT40 End Mill Holder 3/8 Inch Through Coolant

Product Description

The ACCUPRO 775016 is a CAT40 taper shank end mill holder designed for use in CNC machining centers and milling operations requiring precise tool control and internal coolant delivery. The holder accepts a 3/8 inch bore and features a 4 inch projection with a 1 inch nose diameter, making it suitable for applications that demand reach and rigidity. A total indicator runout (TIR) of 0.0002 inches ensures tight concentricity, supporting consistent tool performance during production cutting. Installation and use is handled by CNC machinists and toolroom technicians in both job shop and production environments.

This end mill holder fits CAT40 spindle interfaces common to vertical and horizontal machining centers used in metalworking, mold making, and general precision machining. The 4 inch projection provides clearance for deep-pocket and stepped-feature work. Through-coolant capability supports both through-spindle and DIN flange coolant delivery, directing fluid directly to the cutting edge to extend tool life and manage chip evacuation during high-speed operations. The holder is balanced to 30,000 RPM, making it appropriate for high-speed machining applications where spindle balance is critical.

Key Features

• CAT40 taper shank for standard machining center spindle interface
• 3/8 inch bore diameter with 4 inch projection and 1 inch nose diameter
• TIR of 0.0002 inches for high concentricity and dimensional accuracy
• Through coolant compatible with through-spindle and DIN flange coolant systems
• Balanced to 30,000 RPM for high-speed machining applications
• 5/8-11 drawbar thread size for secure spindle retention

Compatibility

Designed as an OEM-style replacement and standard fitment for CAT40 spindle machining centers accepting 3/8 inch bore end mill holders with 5/8-11 drawbar thread.

Installation Notes

Installation is performed by qualified CNC machinists or toolroom technicians. Power down and lock out the machining center spindle before inserting or removing any toolholder. Ensure the taper and spindle bore are clean and free of chips or contamination before seating the holder. Torque the drawbar to the machine manufacturer's specification and verify coolant port alignment before operating.