Accupro 771138 End Mill Holder CAT50 3/4 Inch

Product Description

The ACCUPRO 771138 is a CAT50 dual contact taper shank end mill holder designed for use on CNC machining centers requiring high-speed, high-precision tool retention. The holder accepts a 3/4-inch bore and provides 3 inches of projection from the spindle face, making it suited for deep-reach milling operations. Dual contact taper engagement improves rigidity and repeatability over standard single-contact tooling. Through-coolant delivery is supported via through-spindle and DIN flange coolant types. The holder is balanced to 25,000 RPM and holds a total indicator reading (TIR) of 0.0002 inch, supporting demanding finishing and contouring applications.

This end mill holder is used on CAT50-spindle CNC vertical and horizontal machining centers in industrial, job shop, and production environments. The 3-inch projection suits applications where extended reach is needed to clear workpiece features or fixtures. The 1-57/64-inch nose diameter and 1.77-inch clamping depth provide a secure grip on standard 3/4-inch shank end mills. A retention knob thread size of 1-8 is required for spindle installation. Licensed machinists and CNC setup technicians perform installation as part of standard tooling changeout procedures.

Key Features

• CAT50 dual contact taper shank for improved rigidity and spindle contact over single-contact designs
• 3/4-inch bore diameter with 1.77-inch clamping depth for secure end mill retention
• 3-inch projection for extended-reach milling applications
• Through-coolant compatible via through-spindle and DIN flange coolant delivery
• Balanced to 25,000 RPM for high-speed machining applications
• TIR of 0.0002 inch for precision tool runout control

Compatibility

Designed for use in CAT50-spindle CNC machining centers requiring dual contact taper tooling with a 1-8 retention knob thread. Accepts standard 3/4-inch shank end mills.

Installation Notes

Installation and removal should be performed by a qualified machinist or CNC setup technician following the machine tool manufacturer's tooling procedures. Power down and lock out the spindle before installing or removing tool holders. Ensure the spindle taper and holder taper are clean and free of chips or coolant residue before seating. Verify retention knob thread compatibility with the machine spindle drawbar before torquing.