Accupro 775020 CAT40 End Mill Holder 7/16 Inch Bore

Product Description

The ACCUPRO 775020 is a CAT40 taper shank end mill holder designed for CNC machining centers requiring precise tool holding with through-coolant capability. The holder accepts a 7/16 inch bore and delivers a 2.5 inch projection from the spindle face, giving machinists clearance for a wide range of milling operations. A total indicator runout (TIR) of 0.0002 inch ensures tight concentricity, reducing tool wear and improving surface finish. The 5/8-11 drawbar thread provides secure spindle engagement. This holder is installed by CNC machinists and toolroom technicians in production and job shop environments.

Suited for vertical and horizontal machining centers equipped with CAT40 spindle interfaces, the 775020 is a go-to holder for standard end mill applications where through-spindle or DIN flange coolant delivery is required. The 2.5 inch projection accommodates workpiece clearance in typical fixture setups. With a balance rating to 30000 RPM, it is appropriate for high-speed machining applications where dynamic balance is critical to spindle bearing life and part quality.

Key Features

• CAT40 taper shank for direct spindle mounting on CAT40-equipped machining centers
• 7/16 inch bore diameter accepts standard end mill shanks
• 2.5 inch projection provides workpiece and fixture clearance
• TIR of 0.0002 inch for high concentricity and reduced tool runout
• Through-coolant compatible via through-spindle and DIN flange coolant delivery
• Balanced to 30000 RPM for high-speed machining applications

Compatibility

Designed for use with CAT40 spindle machining centers accepting a 5/8-11 drawbar thread and through-spindle or DIN flange coolant systems.

Installation Notes

Installation is performed by qualified CNC machinists or toolroom technicians. Power down and lock out the machining center spindle before installing or removing any tool holder. Verify drawbar torque according to the machine manufacturer specifications before operation. Inspect the taper bore and spindle taper for chips or contamination before seating the holder to protect TIR performance.