Accupro 775009 End Mill Holder CAT40 5/16 Inch Through Coolant

Product Description

The ACCUPRO 775009 is a CAT40 taper shank end mill holder designed for precision milling operations on CNC machining centers. It accepts a 5/16 inch tool shank, features a 1 inch nose diameter, and provides 1.38 inches of projection from the gauge line. Through-spindle and DIN flange coolant delivery is supported, directing coolant directly to the cutting zone for improved tool life and chip evacuation. The holder is balanced to 30,000 RPM and holds a TIR of 0.0002 inch, making it suitable for high-speed finishing and semi-finishing applications. The drawbar thread is 5/8-11, standard for CAT40 tooling. Weighing 1 pound, this holder is a direct-mount solution for shops running high-RPM spindle work.

This end mill holder is intended for use in CNC vertical and horizontal machining centers equipped with CAT40 taper spindles. Typical applications include precision milling, contouring, and slotting operations where runout control and balanced rotation are critical. The through-coolant capability makes it well suited for ferrous and non-ferrous material removal where cutting-zone cooling and chip flushing are required. It is installed and set up by CNC machinists and toolroom technicians in production and job shop environments.

Key Features

• CAT40 taper shank for direct spindle mounting on standard machining centers
• Accepts 5/16 inch end mill shanks
• 1 inch nose diameter with 1.38 inches projection
• Through-spindle and DIN flange coolant delivery for cutting-zone cooling
• Balanced to 30,000 RPM for high-speed machining applications
• TIR of 0.0002 inch for precise runout control
• 5/8-11 drawbar thread, standard CAT40 specification

Compatibility

Designed for CNC machining centers with CAT40 taper spindles and a 5/8-11 drawbar thread. Accepts tool shanks with a 5/16 inch diameter.

Installation Notes

Installation should be performed by a qualified CNC machinist or toolroom technician. Ensure the machine spindle is fully stopped and the tool changer is disengaged before mounting or removing this holder. Use the appropriate torque wrench and end mill holder nut wrench when securing the cutting tool to avoid overtightening or damaging the bore. Verify drawbar engagement and confirm runout with a dial indicator before running at elevated spindle speeds.