Accupro 772090 End Mill Holder CAT40 1-1/4 in Hole

Product Description

The ACCUPRO 772090 is a CAT40 taper shank end mill holder designed for CNC machining centers requiring precise tool holding with through-coolant capability. It accepts a 1-1/4 inch bore and delivers a 4 inch projection from the spindle face, making it suitable for operations where extended reach is needed. The holder features a 2.5 inch nose diameter, a clamping depth of 2.55 inches, and a total indicator runout (TIR) of 0.0002 inch, supporting high-accuracy milling work. Balanced to 30,000 RPM, it is suited for high-speed machining environments. Installation is performed by machinists and CNC setup technicians in production and job shop settings.

This end mill holder is used in CNC vertical and horizontal 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 for improved chip evacuation and tool life in demanding milling applications. The 6.75 inch overall length and 4 inch projection make it a practical choice for setups requiring clearance between the spindle nose and workpiece or fixture. It is a standard fitment for production shops running CAT40-tooled machining centers.

Key Features

• CAT40 taper shank for compatibility with CAT40-spindle CNC machining centers
• 1-1/4 inch bore diameter with 2.55 inch clamping depth for secure end mill retention
• Through-coolant design supporting through-spindle and DIN flange coolant delivery
• TIR of 0.0002 inch for high-precision tool concentricity
• Balanced to 30,000 RPM for high-speed machining applications
• Drawbar and retention knob thread size of 5/8-11 for standard CAT40 tooling compatibility

Compatibility

Designed as a standard OEM-style replacement or new-installation end mill holder for CNC machining centers with a CAT40 spindle interface and 5/8-11 drawbar thread specification.

Installation Notes

Installation should be performed by a qualified machinist or CNC tooling technician. Power down and lock out the machining center spindle before installing or removing any tooling. Verify drawbar engagement and retention knob torque per the machine tool manufacturer specifications before operation. Confirm through-coolant fittings and seals are properly seated before resuming coolant flow.