Accupro 772026 End Mill Holder CAT40 5/16 in Through Coolant

Product Description

The ACCUPRO 772026 is a CAT40 taper shank end mill holder designed for use in CNC machining centers where precision toolholding and coolant delivery are required. It accepts a 5/16 inch bore and delivers a 4 inch projection from the spindle face, giving machinists the clearance needed for deep-reach milling operations. The holder features through-spindle and DIN flange coolant delivery, a 1 inch nose diameter, and is balanced to 30,000 RPM for use in high-speed applications. Total indicator runout (TIR) is rated at 0.0002 inches, supporting tight-tolerance work in ferrous and non-ferrous materials.

This end mill holder is suited for production and job-shop CNC vertical and horizontal machining centers running CAT40 spindle interfaces. The 4 inch projection makes it a practical choice when extended reach is needed to clear fixtures or workpiece features. The 5/8-11 drawbar and retention knob thread sizes are standard for CAT40 tooling systems. It is typically installed and set up by CNC machinists, toolroom technicians, or setup technicians working in precision manufacturing environments.

Key Features

• CAT40 taper shank for standard CNC machining center spindle interface
• 5/16 inch bore diameter with 1.2600 inch clamping depth for secure tool engagement
• 4 inch projection for extended reach milling applications
• Through-spindle and DIN flange coolant delivery for chip evacuation and tool cooling
• Balanced to 30,000 RPM for high-speed machining compatibility
• TIR of 0.0002 inches for precision toolholding accuracy

Compatibility

Designed as a direct-fit toolholder for CNC machining centers with a CAT40 spindle interface and a 5/8-11 drawbar thread. Accepts standard 5/16 inch shank end mills and compatible cutting tools.

Installation Notes

Installation should be performed by a qualified CNC machinist or toolroom technician with the machine powered down and the spindle fully stopped before mounting or removing toolholders. Use a proper CAT40 tool-holding fixture or vise to secure the holder during tool clamping — never clamp on the taper itself. Verify retention knob torque per machine builder specifications and confirm TIR with a dial indicator after installation before resuming cutting operations.