Accupro 772024 End Mill Holder CAT40 5/16 Inch Through Coolant

Product Description

The ACCUPRO 772024 is a CAT40 taper shank end mill holder designed for use in CNC machining centers requiring precise tool clamping and through-coolant delivery. The holder accepts a 5/16 inch bore and features a 7/8 inch nose diameter with a 2.5 inch projection, placing the cutting tool at the correct standoff for a wide range of milling operations. Balanced to 30,000 RPM, it maintains a total indicator runout (TIR) of 0.0002 inch, supporting high-speed finishing and general-purpose milling where concentricity is critical. Installation is performed by qualified machinists or toolroom technicians.

This end mill holder is suited for vertical and horizontal CNC machining centers equipped with CAT40 spindle interfaces. The through-coolant design supports both through-spindle and DIN flange coolant delivery, directing fluid directly to the cutting zone to improve chip evacuation and extend tool life. It is a practical choice for shops running high-speed operations or working with materials that generate significant heat at the cutting edge. The 1.26 inch clamping depth provides secure tool retention across the full RPM range.

Key Features

• CAT40 taper shank for compatibility with standard CAT40 spindle interfaces
• 5/16 inch bore diameter with 1.26 inch clamping depth for secure end mill retention
• Through-coolant capable via through-spindle and DIN flange coolant paths
• Balanced to 30,000 RPM for high-speed milling applications
• TIR of 0.0002 inch for consistent concentricity and surface finish quality
• Retention knob thread size of 5/8-11 for standard CAT40 drawbar compatibility

Compatibility

Designed as an OEM-style replacement and standard fitment for CNC machining centers with CAT40 spindle interfaces requiring a 5/16 inch bore end mill holder with through-coolant capability.

Installation Notes

Installation should be performed by a qualified machinist or toolroom technician familiar with CNC tooling systems. Power down and lock out the machining center spindle before mounting or removing the tool holder. Use a calibrated torque wrench and the appropriate CAT40 tooling fixtures when seating the retention knob to ensure proper drawbar engagement. Verify TIR after installation using a dial indicator before commencing any cutting operation.