Accupro 771255 CAT40 Milling Chuck 1 Inch Bore

Product Description

The ACCUPRO 771255 is a CAT40 milling chuck designed for precision milling operations on CNC machining centers. It features a 1.0000-inch bore diameter and a dual contact taper shank that engages both the spindle taper and the spindle face, improving rigidity and reducing runout. With a total indicator runout (TIR) of 0.0002 inches, this chuck maintains tight tolerances suitable for demanding finish and roughing applications. Through-spindle coolant support directs cutting fluid directly to the tool tip for improved chip evacuation and tool life. Machinists and CNC setup technicians install this chuck in production and job-shop environments where accuracy and repeatability are critical.

The 771255 is suited for vertical and horizontal CNC machining centers equipped with CAT40 spindles. The dual contact taper shank is particularly effective at higher spindle speeds where face contact reduces Z-axis displacement. A 2.4100-inch nose diameter and 3.5400-inch projection provide clearance for a range of milling operations including peripheral milling, slotting, and face milling. Overall length is 6.2200 inches, making it compatible with standard tooling carousels and automatic tool changers found on most CAT40-equipped machines.

Key Features

• CAT40 dual contact taper shank for enhanced rigidity at the spindle face and taper
• 1.0000-inch bore diameter for precise tool holding
• TIR of 0.0002 inches for high-accuracy milling applications
• Through-spindle coolant compatible for improved chip evacuation and tool life
• 2.4100-inch nose diameter and 3.5400-inch projection for workpiece clearance
• 6.2200-inch overall length compatible with standard automatic tool changers

Compatibility

Designed for use with CAT40-spindle CNC machining centers equipped for dual contact taper tooling and through-spindle coolant delivery.

Installation Notes

Installation should be performed by a qualified CNC machinist or tooling technician. Power down and lock out the machine spindle before inserting or removing tooling. Use the appropriate CAT40 retention knob and torque it according to the machine spindle manufacturer specifications. Verify TIR at the tool tip with a dial test indicator after installation before commencing any cutting operation.