Accupro 771024 CAT40 End Mill Holder 1/2 Inch Through Coolant

Product Description

The ACCUPRO 771024 is a CAT40 dual contact taper shank end mill holder designed for use in CNC machining centers requiring high-speed, high-precision toolholding. It accepts a 1/2 inch tool shank, delivers a projection of 1.75 inches, and features a 1-3/8 inch nose diameter. The dual contact taper interface engages both the taper and the spindle face simultaneously, improving rigidity and reducing runout compared to standard single-contact toolholders. Through-coolant capability routes fluid directly to the cutting zone for improved chip evacuation and tool life. This holder is installed and serviced by CNC machinists and tool crib technicians in production and job shop environments.

The 771024 is suited for milling operations on vertical and horizontal machining centers equipped with CAT40 spindles. It is appropriate for use in both roughing and finishing applications where stable clamping and consistent tool projection are required. The 1-1/2 inch clamping depth provides secure grip on end mills and other shank-type cutting tools with 1/2 inch shanks. The retention knob thread size is 5/8-11, which is the standard for CAT40 tooling systems. Balanced to 30,000 RPM, it is compatible with high-speed spindle applications.

Key Features

• CAT40 dual contact taper shank engages both taper and spindle face for improved rigidity and reduced runout
• Through-coolant design supports through-spindle and DIN flange coolant delivery
• Accepts 1/2 inch shank cutting tools with 1-1/2 inch clamping depth
• Balanced to 30,000 RPM for high-speed machining center use
• 1.75 inch projection and 1-3/8 inch nose diameter for clearance in typical milling setups
• Retention knob thread size 5/8-11 matches standard CAT40 pull studs

Compatibility

Designed for use in CNC machining centers equipped with CAT40 dual contact spindle interfaces and 5/8-11 retention knob threads. Accepts 1/2 inch straight-shank end mills and compatible cutting tools.

Installation Notes

Installation should be performed by a qualified CNC machinist or toolroom technician. Power down and lock out the machining center spindle before changing or torquing toolholders. Use the appropriate CAT40 taper cleaning brush and inspect the spindle taper for contamination before seating the holder. Follow the machine tool manufacturer specifications for pull stud torque and drawbar force; do not use impact tools on retention knobs.