Accupro 775004 End Mill Holder CAT40 3/16 Inch Through Coolant

Product Description

The ACCUPRO 775004 is a CAT40 taper shank end mill holder designed for precision tool holding in CNC machining centers. It accepts a 3/16 inch bore and features through-coolant capability, directing coolant through the spindle and DIN flange directly to the cutting zone. With a 2.5 inch projection and a 3/4 inch nose diameter, this holder positions the tool at a consistent working distance from the spindle face. A TIR of 0.0002 inches ensures the concentricity required for finishing passes and tight-tolerance work. The drawbar thread is 5/8-11, standard for CAT40 tooling. Machinists and CNC setup technicians install this holder in vertical and horizontal machining centers.

This end mill holder is suited for production and job-shop environments running CAT40 spindles. The through-coolant design supports high-speed operations where flood coolant alone is insufficient to reach the cutting edge. It is balanced to 30,000 RPM, making it appropriate for high-speed machining applications including aluminum, steel, and other materials where spindle speeds exceed conventional ranges. The 3/16 inch bore targets smaller diameter end mills used in profiling, slotting, and contouring operations.

Key Features

• CAT40 taper shank for direct spindle mounting on CAT40 machining centers
• 3/16 inch bore diameter for small-diameter end mill tooling
• Through-coolant compatible via through-spindle and DIN flange coolant delivery
• TIR of 0.0002 inches for high-concentricity tool holding
• Balanced to 30,000 RPM for high-speed machining applications
• 5/8-11 drawbar thread, standard for CAT40 tooling systems

Compatibility

Designed for use with CAT40 spindle machining centers that support through-spindle coolant and DIN flange coolant delivery. Compatible with end mills having a 3/16 inch shank diameter and a standard 5/8-11 drawbar connection.

Installation Notes

Installation should be performed by a qualified CNC machinist or tooling technician with the spindle fully powered down and locked out per the machine manufacturer's lockout/tagout procedure. Use the appropriate spanner wrench and toolholder tightening fixture to torque the end mill set screw without side-loading the holder. Confirm through-coolant passages are clear before assembly. Verify TIR at the tool tip with a dial test indicator after installation to confirm proper seating.