Accupro 775010 End Mill Holder CAT40 5/16 Inch Through Coolant

Product Description

The ACCUPRO 775010 is a CAT40 taper shank end mill holder designed for secure tool retention in vertical and horizontal machining centers. It accepts a 5/16 inch bore and features a 2.5 inch projection with a 1 inch nose diameter. Through-coolant capability routes cutting fluid directly to the tool tip, supporting high-speed and high-precision milling operations. The holder is balanced to 30,000 RPM and carries a total indicator runout (TIR) of 0.0002 inch, making it suitable for tight-tolerance work in production environments. A 5/8-11 drawbar thread provides standard spindle engagement.

This end mill holder is used in CNC machining centers running CAT40 spindles, common in both job-shop and production-floor settings. The 2.5 inch projection suits applications where clearance is needed for deep-pocket milling or where the tool must extend past a workholding fixture. Through-spindle and DIN flange coolant compatibility gives the user flexibility across different machine configurations. Machinists and toolroom technicians are the primary users for installation and setup.

Key Features

• CAT40 taper shank for standard machining center spindle compatibility
• 5/16 inch bore accepts standard end mill shanks
• 2.5 inch projection for reach in deep-pocket or fixure-clearance applications
• Through-coolant capable via through-spindle and DIN flange coolant types
• Balanced to 30,000 RPM for high-speed machining
• TIR of 0.0002 inch for precise tool runout control

Compatibility

Designed as an OEM-style replacement and standard tooling solution for CNC machining centers equipped with CAT40 spindles and using 5/8-11 drawbar thread engagement.

Installation Notes

Installation and tool changes should be performed by a qualified machinist or toolroom technician with the machine fully powered down and the spindle at rest. Use a torque wrench and the machine manufacturer's drawbar tightening procedure — do not rely on hand-tightening alone. Verify TIR with a dial indicator after seating the holder before beginning any cutting operation. Ensure the coolant supply line is compatible with through-spindle delivery before enabling through-coolant flow.