Accupro 777658 CAT40 Milling Chuck 1-1/4 in Through Coolant

Product Description

The ACCUPRO 777658 is a CAT40 milling chuck designed for secure tool holding in CNC machining centers. It features a 1.25-inch hole diameter and a CAT40 taper shank for positive engagement with the spindle. The nose diameter measures 2.88 inches, and the projection is 3.54 inches, making it suitable for a range of milling operations where tool reach and rigidity are critical. Through-spindle coolant capability directs cutting fluid directly to the tool tip, improving chip evacuation and extending tool life. The chuck is balanced to 10,000 RPM, supporting high-speed milling applications. Installation is performed by qualified CNC machinists or toolroom personnel.

This CAT40 milling chuck fits vertical and horizontal machining centers equipped with a CAT40 spindle interface. The 1.25-inch bore accommodates standard milling shanks of that diameter. With a clamping depth of 3.34 inches and a TIR of 0.0002 inches, this chuck delivers the concentricity required for finish milling, contouring, and general-purpose cutting operations in production or job-shop environments. The through-coolant feature makes it particularly well suited to deep-pocket milling and hard-material applications where heat management is a priority.

Key Features

• CAT40 taper shank for direct spindle mounting on compatible machining centers
• 1.25-inch hole diameter with 3.34-inch clamping depth for secure tool engagement
• Through-spindle coolant support directs fluid to the cutting zone
• TIR of 0.0002 inches ensures high concentricity for precision milling
• Balanced to 10,000 RPM for stable high-speed operation
• Nose diameter of 2.88 inches and projection of 3.54 inches suit a wide range of milling setups

Compatibility

Designed for use in CNC machining centers with a CAT40 spindle taper interface and through-spindle coolant capability.

Installation Notes

Installation should be performed by a qualified CNC machinist or toolroom technician. Ensure the spindle and chuck taper are clean and free of chips or oil film before seating the holder. Use a properly calibrated pull-stud torque procedure per the machine tool manufacturer's specifications. Verify tool runout with a dial indicator after clamping before initiating any cutting cycle.