Accupro 771202 CAT40 Shell Mill Holder 1.25 in Pilot

Product Description

The ACCUPRO 771202 is a CAT40 shell mill holder with a dual contact taper shank, designed for milling operations on CNC machining centers. It features a 1.25 inch pilot diameter, a 4 inch projection from flange to nose end, and an overall length of 6.6870 inches. Through-coolant capability is supported via both through-spindle and DIN flange delivery, keeping the cutting zone clear during heavy material removal. The holder is balanced to 10,000 RPM and achieves a TIR of 0.0002 inches, making it suitable for precision face milling and shell mill applications. A licensed machinist or CNC setup technician is the primary installer for this tooling component.

This holder is intended for use on CNC vertical and horizontal machining centers equipped with a CAT40 spindle interface. It accommodates shell mill cutting diameters ranging from 3 inches to 3.5 inches. The dual contact taper shank engages both the taper and the spindle face simultaneously, improving rigidity and reducing runout compared to standard single-contact CAT40 holders. The through-coolant design with DIN flange support makes it well suited for applications where directed coolant flow to the cutter is required.

Key Features

• CAT40 dual contact taper shank for improved spindle rigidity and reduced runout
• 1.25 inch pilot diameter with 4 inch flange-to-nose projection
• Through-coolant compatible via through-spindle and DIN flange coolant delivery
• Balanced to 10,000 RPM for stable high-speed milling
• TIR of 0.0002 inches for precision tool positioning
• Lock screw thread size 5/8-18 for secure shell mill retention

Compatibility

Designed for use with shell mills in the 3 inch to 3.5 inch cutting diameter range on CAT40 dual contact spindle machines. No additional specific model compatibility data was provided in the product input.

Installation Notes

This toolholder is installed by a qualified CNC machinist or toolroom technician. Always power down and lock out the machining center spindle before seating or removing the holder. Verify the spindle taper and holder taper are clean and free of chips or coolant deposits before installation. Confirm lock screw engagement torque meets the machine tool builder's specifications prior to operation.