Accupro 772050 End Mill Holder CAT40 1/2 Inch Bore

Product Description

The ACCUPRO 772050 is a CAT40 taper shank end mill holder designed for use in CNC machining centers requiring precise tool retention and through-coolant delivery. The holder accepts a 1/2 inch bore and provides 4 inches of projection from the spindle face, making it suited for operations where extended reach is needed. With a TIR of 0.0002 inches and a balance rating of 30,000 RPM, this holder supports high-speed finishing and semi-finishing operations. A 1-3/8 inch nose diameter and 1-1/2 inch clamping depth provide secure tool grip under demanding cutting conditions. Installation requires a 5/8-11 retention knob thread compatible pull stud.

This end mill holder is used in vertical and horizontal machining centers equipped with CAT40 spindle interfaces. Typical applications include milling, profiling, and contouring operations in job shops, production facilities, and tool rooms. The through-coolant capability supports chip evacuation and tool life in deep-pocket milling and high-speed applications where flood coolant alone is insufficient. It is installed and serviced by CNC machinists and tool crib technicians.

Key Features

• CAT40 taper shank for standard machining center spindle interface
• 1/2 inch bore diameter with 1-1/2 inch clamping depth for secure tool retention
• 4 inches projection for extended reach applications
• Through-spindle and DIN flange coolant delivery
• 0.0002 inch TIR for high-precision runout control
• Balanced to 30,000 RPM for high-speed machining compatibility

Compatibility

Designed as an OEM-style replacement and standard fitment for CAT40 spindle machining centers requiring a 1/2 inch bore end mill holder with through-coolant and 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 spindle before inserting or removing the holder. Use a CAT40-compatible tool setter or presetter to verify projection and runout before running. Torque the set screw to the toolholder manufacturer specification using the correct hex key — do not overtighten, as this can distort the bore and increase TIR.