Accupro 771226 Shell Mill Holder CAT50 1.25 Inch Pilot

Product Description

The ACCUPRO 771226 is a CAT50 dual contact taper shank shell mill holder designed for rigidity and precision in milling operations. It features a 1.25 inch pilot diameter and an overall length of 8 inches, with a 4 inch projection from flange to nose end. The dual contact taper shank engages both the taper and the spindle face simultaneously, increasing stiffness and reducing runout. TIR is rated at 0.0002 inches, making it suitable for demanding face milling and shell milling applications. Licensed machinists and CNC setup technicians install this holder in machining centers equipped with CAT50 spindles.

This shell mill holder is used in vertical and horizontal machining centers running CAT50 tooling. It supports shell mill cutting diameters in the 3 inch to 3.5 inch range and is balanced to 10,000 RPM, making it appropriate for both roughing and semi-finish milling passes. Through coolant is supported via through-spindle and DIN flange delivery, allowing direct coolant flow to the cutting zone for improved chip evacuation and tool life in production environments.

Key Features

• CAT50 dual contact taper shank for increased spindle rigidity and face contact stability
• 1.25 inch pilot diameter with 2.88 inch nose diameter for secure shell mill clamping
• TIR of 0.0002 inches for high-precision milling applications
• Through coolant compatible via through-spindle and DIN flange delivery
• Balanced to 10,000 RPM for reliable performance at elevated spindle speeds
• Lock screw thread size 5/8-18 for standard shell mill attachment

Compatibility

Designed for use with CAT50 spindle machining centers. Accepts shell mill cutters in the 3 inch to 3.5 inch cutting diameter range. Lock screw thread size is 5/8-18.

Installation Notes

Installation should be performed by a qualified machinist or CNC technician. Power down and lock out the machining center spindle before mounting or removing the holder. Ensure the taper and spindle face contact surfaces are clean and free of chips or burrs before seating the holder, as dual contact tapers require full face engagement to function correctly. Torque the retention knob to the machining center manufacturer's specification.