Accupro 775074 End Mill Holder CAT50 1/4 Inch Through Coolant

Product Description

The ACCUPRO 775074 is a CAT50 taper shank end mill holder designed for precision milling operations on CNC machining centers. It accepts a 1/4 inch tool shank, offers a 4 inch projection, and includes through-coolant capability to support high-speed and high-efficiency cutting. The holder is balanced to 25,000 RPM, making it suitable for demanding spindle speeds found in modern vertical and horizontal machining centers. A total indicator runout (TIR) of 0.0002 inch ensures consistent tool concentricity, which directly affects surface finish and tool life. Machining technicians and CNC setup personnel are the primary users of this toolholder.

This end mill holder is suited for use on CNC machining centers equipped with CAT50 spindle interfaces. The 4 inch projection accommodates workpieces requiring reach beyond the spindle face. Through-coolant delivery is compatible with both through-spindle and DIN flange coolant systems, making it adaptable to a range of machine configurations. It is commonly used in production environments for milling, slotting, and peripheral cutting operations where tool rigidity and runout control are critical.

Key Features

• CAT50 taper shank for direct mounting in CAT50-compatible spindles
• 1/4 inch hole diameter for standard end mill shank fitment
• 4 inch projection for extended reach applications
• Through-coolant support via through-spindle and DIN flange coolant systems
• Balanced to 25,000 RPM for high-speed machining compatibility
• TIR of 0.0002 inch for consistent tool concentricity and surface finish

Compatibility

Designed for use with CNC machining centers equipped with a CAT50 taper spindle interface. Through-coolant functionality is compatible with through-spindle and DIN flange coolant delivery systems.

Installation Notes

Installation should be performed by a qualified CNC machinist or toolroom technician familiar with CAT50 toolholder assembly procedures. Ensure the spindle is fully stopped and the machine is in a safe, locked-out state before mounting or removing the holder. Use the appropriate drawbar with a 1-8 thread size as specified for CAT50 tooling. Verify tool runout with a dial indicator after installation to confirm concentricity is within acceptable limits for the application.