Accupro 775136 End Mill Holder CAT50 7/8 Inch Bore

Product Description

The ACCUPRO 775136 is a CAT50 taper shank end mill holder designed for high-precision CNC milling applications. It features a 7/8-inch bore diameter and a 2-inch nose diameter with a 3.75-inch projection length. Through-coolant capability is built in, supporting both through-spindle and DIN flange coolant delivery. The holder is balanced to 25,000 RPM and holds a total indicator runout (TIR) of 0.0002 inches, making it suitable for demanding finishing and roughing operations where tool concentricity is critical. A drawbar thread size of 1-8 secures it in the spindle. Machinists and CNC setup technicians working in production shops are the primary installers.

This end mill holder is intended for use in CNC machining centers equipped with CAT50 spindle interfaces. The 3.75-inch projection provides adequate clearance for a wide range of end mill lengths in both vertical and horizontal machining center configurations. The through-coolant design supports high-speed cutting operations where directed coolant flow to the cutting zone is required for chip evacuation and tool life. It is suited for both light finishing cuts and heavier material removal in ferrous and non-ferrous workpiece materials.

Key Features

• CAT50 taper shank for positive engagement in CAT50-spindle machining centers
• 7/8-inch bore diameter accommodates standard end mill shank sizes
• 3.75-inch projection for clearance in deep-cavity and extended-reach setups
• Through-coolant compatible via through-spindle and DIN flange coolant delivery
• Balanced to 25,000 RPM for stable high-speed operation
• TIR of 0.0002 inches ensures tight tool concentricity

Compatibility

Designed as an OEM-style replacement and standard fitment for CAT50-spindle CNC machining centers requiring a 7/8-inch bore end mill holder with through-coolant capability.

Installation Notes

Installation should be performed by a qualified CNC machinist or toolroom technician. Power down and lock out the machining center spindle before inserting or removing the holder. Use a calibrated torque wrench on the drawbar and verify runout at the bore with a dial indicator after seating. Follow the machining center manufacturer specifications for drawbar engagement and coolant system pressure before resuming operation.