Accupro 772068 End Mill Holder CAT40 3/4 Inch Bore

Product Description

The ACCUPRO 772068 is a CAT40 taper shank end mill holder designed for precision tool holding in CNC machining centers. It accepts a 3/4 inch bore and delivers a 3 inch projection, making it well suited for operations that require extended reach without sacrificing rigidity. The holder supports through-coolant delivery via both through-spindle and DIN flange coolant types, directing fluid directly to the cutting zone. With a total indicator runout (TIR) of 0.0002 inches and a balance rating of 30,000 RPM, this holder meets the demands of high-speed finish milling and general-purpose material removal in production environments. Installation is handled by qualified CNC machine operators and toolroom technicians.

This end mill holder is intended for use in CAT40-spindle CNC vertical and horizontal machining centers. The 3 inch projection and 1-3/4 inch nose diameter accommodate a wide range of end mill shank configurations and workholding clearances. The through-coolant feature is especially useful in deep-pocket milling, long-reach operations, and applications involving difficult-to-machine materials where flood coolant alone is insufficient. The 5/8-11 retention knob thread size is standard for CAT40 tooling systems.

Key Features

• CAT40 taper shank for compatibility with CAT40 CNC spindles
• 3/4 inch bore diameter with 1.77 inch clamping depth for secure end mill retention
• 3 inch projection (1-3/4 inch nose diameter) for extended reach applications
• Through-coolant capable via through-spindle and DIN flange coolant paths
• TIR of 0.0002 inches for high-precision, low-runout tool holding
• Balanced to 30,000 RPM for high-speed machining operations
• 5/8-11 retention knob thread size conforming to CAT40 standards

Compatibility

Designed as a standard CAT40 end mill holder for use in CNC machining centers equipped with CAT40 spindle interfaces and through-spindle or DIN flange coolant systems.

Installation Notes

Installation should be performed by a qualified CNC toolroom technician or machine operator. Ensure the spindle is fully powered down and locked out before changing tooling. Use the appropriate CAT40 retention knob and a calibrated torque wrench per the machine tool manufacturer specifications when seating the holder. Confirm TIR with a dial indicator after installation before resuming cuts.