Accupro 775012 End Mill Holder CAT40 3/8 Inch Through Coolant

Product Description

The ACCUPRO 775012 is a CAT40 taper shank end mill holder designed for use in CNC machining centers requiring precise tool holding and through-coolant delivery. Built with a 3/8 inch bore, a 1 inch nose diameter, and a 1.38 inch projection, this holder positions cutting tools accurately while maintaining a total indicator runout (TIR) of 0.0002 inches. The CAT40 interface is one of the most widely adopted taper standards in North American CNC machining, making this holder a common fit across vertical and horizontal machining centers. Coolant is delivered through the spindle and DIN flange, directing fluid directly to the cutting zone for improved tool life and chip evacuation.

This end mill holder is suited for production machining environments where coolant management and tool runout directly affect part quality and cycle time. The 30000 RPM balance rating makes it appropriate for high-speed machining applications including aluminum, composites, and other materials that benefit from elevated spindle speeds. It is installed and removed by CNC machinists or toolroom technicians and is compatible with standard CAT40 spindle tooling setups using a 5/8-11 drawbar thread.

Key Features

• CAT40 taper shank for broad compatibility with North American CNC machining centers
• 3/8 inch bore diameter with 1.38 inch projection for precise tool positioning
• Through-coolant capability via spindle and DIN flange for directed coolant delivery
• TIR of 0.0002 inches for accurate, low-runout tool holding
• Balanced to 30000 RPM for high-speed machining applications
• 5/8-11 drawbar thread for secure spindle engagement

Compatibility

Designed as an OEM-style replacement and standard tooling option for CNC machining centers equipped with a CAT40 taper spindle and through-spindle or DIN flange coolant delivery.

Installation Notes

Installation and removal should be performed by a qualified CNC machinist or toolroom technician with the machine powered down and the spindle fully stopped. Use a proper CAT40 tool holder tightening fixture and appropriate torque wrench setup per the machine tool manufacturer guidelines. Verify drawbar engagement with the 5/8-11 thread before spindle operation. Inspect the taper bore and spindle taper for debris or damage prior to seating the holder.