Accupro 775054 CAT40 End Mill Holder 1 in Bore Through Coolant

Product Description

The ACCUPRO 775054 is a CAT40 taper shank end mill holder designed for CNC machining centers requiring precise tool holding and high-speed performance. It accepts a 1 inch bore and provides a 2 inch projection, positioning the cutting tool at the correct standoff from the spindle face. The 2-1/2 inch nose diameter provides rigidity and support during heavy cutting operations. Built with through-coolant capability, this holder directs cutting fluid directly to the tool tip, improving chip evacuation and extending tool life. The 5/8-11 drawbar thread matches standard CAT40 spindle pull-studs. With a TIR of 0.0002 inches, this holder delivers the concentricity required for finish milling and tight-tolerance work.

This end mill holder is suited for vertical and horizontal CNC machining centers equipped with CAT40 spindles. It is a standard choice for production shops, tool rooms, and job shops running end mills, roughers, or keyseat cutters in steel, aluminum, and other materials. Through-spindle and DIN flange coolant types are both supported, making it compatible with a range of machine coolant configurations. Licensed machinists and CNC setup technicians handle installation and balancing checks as part of routine tool changes.

Key Features

• CAT40 taper shank for direct mounting in CAT40 spindles
• 1 inch bore diameter accommodates standard end mill shanks
• 2 inch projection for correct tool positioning and clearance
• Through-coolant design supports through-spindle and DIN flange coolant delivery
• TIR of 0.0002 inches ensures concentricity for precision machining
• Balanced to 30,000 RPM for high-speed spindle applications
• 5/8-11 drawbar thread matches standard CAT40 pull-stud specifications

Compatibility

Designed as an OEM-style replacement and standard tooling option for CNC machining centers with CAT40 taper spindles.

Installation Notes

Installation is performed by a qualified CNC machinist or toolroom technician. Before inserting or removing this holder, confirm the machine is in an E-stop condition and the spindle is fully stopped. Use the correct pull-stud torque procedure specified by the machine manufacturer for CAT40 retention knobs. Inspect the taper and spindle bore for chips or contamination before seating the holder, and verify coolant passages are clear before operation.