Accupro 772032 CAT40 End Mill Holder 3/8 Inch Through Coolant

Product Description

The ACCUPRO 772032 is a CAT40 taper shank end mill holder designed for CNC machining centers requiring precise tool retention and internal coolant delivery. The holder accepts a 3/8 inch bore and provides 2.5 inches of projection, making it well suited for applications that demand clearance between the spindle face and the workpiece. With a total indicator runout (TIR) of 0.0002 inches and a balance rating of 30,000 RPM, this holder supports high-speed finishing operations where concentricity directly affects surface finish and tool life. A licensed machinist or CNC setup technician is the typical installer.

This end mill holder fits CNC vertical and horizontal machining centers equipped with a CAT40 spindle interface. The 1-17/64 inch nose diameter and 1.26 inch clamping depth provide secure engagement for standard end mills with a 3/8 inch shank. The through-spindle and DIN flange coolant compatibility allows directed coolant flow to the cutting edge, reducing heat buildup during extended cutting cycles. It is appropriate for production and job-shop environments running steel, aluminum, and other common workpiece materials at elevated spindle speeds.

Key Features

• CAT40 taper shank for direct spindle mounting on standard CNC machining centers
• 3/8 inch bore with 1.26 inch clamping depth for secure end mill retention
• 2.5 inch projection for clearance in deep-cavity and shouldered-part applications
• TIR of 0.0002 inches supports high-precision finishing and extended tool life
• Balanced to 30,000 RPM for compatibility with high-speed spindle applications
• Through-spindle and DIN flange coolant delivery directs flow to the cutting zone

Compatibility

Designed as an OEM-style replacement and direct-fit tool holder for CNC machining centers with a CAT40 spindle interface accepting a 5/8-11 retention knob thread.

Installation Notes

Installation is performed by a qualified CNC machinist or toolroom technician. Power down and lock out the machining center before inserting or removing the holder from the spindle. Use a torque wrench and the machine manufacturer's recommended procedure when tightening the retention knob to the drawbar. Inspect the taper shank and spindle bore for chips or contamination before seating the holder, as debris will affect runout and balance.