Accupro 775028 End Mill Holder CAT40 1/2 in Bore

Product Description

The ACCUPRO 775028 is a CAT40 taper shank end mill holder designed for CNC machining centers requiring precise tool retention and minimal runout. Built to accept a 1/2 inch bore, this holder delivers a TIR of 0.0002 inch, supporting tight-tolerance milling operations. With a 4 inch projection from gauge line, it provides clearance for a wide range of end mill geometries and workpiece configurations. The 5/8-11 drawbar thread is standard for CAT40 spindles, and the holder is balanced to 30,000 RPM, making it suitable for high-speed machining applications. Machinists and CNC setup technicians install this holder as a direct interface between the machine spindle and the cutting tool.

This end mill holder is intended for use on CAT40-spindle vertical and horizontal machining centers in job shop, production, and toolroom environments. The 4 inch projection suits applications where extended reach is needed to clear fixtures, vises, or deep-cavity workpieces. Through-coolant is not supported by this holder, so external coolant delivery should be used when required by the operation. It is packaged as a single unit and is appropriate for facilities standardizing on CAT40 tooling across their machining cell.

Key Features

• CAT40 taper shank for compatibility with standard CAT40 spindle machines
• 1/2 inch bore diameter for direct end mill retention
• TIR of 0.0002 inch for high-precision milling operations
• 4 inch projection provides reach clearance for complex setups
• Balanced to 30,000 RPM supporting high-speed cutting applications
• 5/8-11 drawbar thread matches standard CAT40 machine spindle requirements

Compatibility

Designed as an OEM-style end mill holder for CNC machining centers equipped with a CAT40 taper spindle and a 5/8-11 drawbar thread.

Installation Notes

Installation should be performed by a qualified machinist or CNC setup technician with the machine in a locked-out, zero-energy state per applicable lockout/tagout procedures. The holder should be seated fully in the spindle taper and secured using a calibrated torque wrench on the drawbar to manufacturer specification. Inspect the taper bore and holder shank for contamination or nicks before assembly, as surface defects directly affect runout. Do not use this holder for through-spindle coolant applications, as it does not support that feature.