Accupro 775022 CAT40 End Mill Holder 7/16 in Through Coolant

Product Description

The ACCUPRO 775022 is a CAT40 taper shank end mill holder designed for CNC machining centers requiring precise tool retention and through-coolant delivery. The holder accepts a 7/16 inch bore and provides 4 inches of projection from the gauge line, giving operators clearance for a wide range of milling operations. Total Indicated Runout (TIR) is rated at 0.0002 inches, supporting tight-tolerance work where tool concentricity directly affects surface finish and tool life. Balanced to 30,000 RPM, this holder suits high-speed machining applications in both production and job-shop environments.

This holder is used in vertical and horizontal machining centers equipped with CAT40 spindles. The 5/8-11 drawbar thread is the standard for CAT40 tooling, making this a direct fit for most domestic CNC machines running that taper standard. Through-coolant capability is supported via both through-spindle and DIN flange coolant paths, allowing directed coolant flow to the cutting edge for improved chip evacuation and thermal control in deep-pocket or high-feed milling. Machinists and CNC setup technicians are the primary installers.

Key Features

• CAT40 taper shank with 5/8-11 drawbar thread for standard domestic CNC spindle compatibility
• 7/16 inch bore diameter accepts common end mill shank sizes
• 4 inch projection provides clearance for extended-reach milling operations
• TIR of 0.0002 inches supports tight-tolerance and finish milling
• Balanced to 30,000 RPM for high-speed machining center use
• Through-spindle and DIN flange coolant delivery for directed cutting-zone cooling

Compatibility

Designed for CNC machining centers with CAT40 taper spindles and 5/8-11 drawbar thread. Compatible with end mills having a 7/16 inch shank diameter.

Installation Notes

Installation should be performed by a qualified machinist or CNC setup technician with the spindle powered down and the machine placed in an appropriate lockout/tagout state. Use a CAT40-rated toolsetter or torque wrench and follow the machine tool manufacturer's drawbar torque guidelines. Verify TIR with a dial test indicator after clamping before running the spindle. Ensure the through-coolant path is clear and the coolant supply is matched to the holder's DIN flange or through-spindle configuration before engaging coolant flow.