Accupro 775142 CAT50 End Mill Holder 1 in Hole Through Coolant

Product Description

The ACCUPRO 775142 is a CAT50 taper shank end mill holder designed for use in CNC machining centers where rigidity and coolant delivery are critical. It accepts a 1-inch bore and provides a 4-inch projection from the gauge line, giving adequate clearance for deep-cavity milling and extended-reach applications. The nose diameter measures 2-23/64 inches. Through-coolant capability is built in, supporting both through-spindle and DIN flange coolant supply. The holder is balanced to 25,000 RPM and holds a TIR of 0.0002 inches, making it suitable for high-speed finishing and precision roughing operations. Machinists and CNC setup technicians are the primary installers.

This holder is suited for production and job-shop CNC vertical and horizontal machining centers equipped with CAT50 spindles. The 4-inch projection accommodates tooling setups that require standoff from the spindle face, such as deep-pocket milling, contour work, or situations where workholding fixtures limit how close the spindle can approach the part. Through-coolant delivery keeps cutting edges lubricated and flushes chips directly at the cut zone, extending tool life in ferrous and non-ferrous materials alike.

Key Features

• CAT50 taper shank for direct mounting in CAT50-spindle machining centers
• 1-inch bore accepts standard 1-inch shank end mills and cutting tools
• 4-inch projection for extended reach and deep-cavity clearance
• Through-coolant compatible via through-spindle and DIN flange coolant systems
• Balanced to 25,000 RPM for high-speed machining applications
• TIR of 0.0002 inches for precision runout control

Compatibility

Designed for CNC machining centers equipped with a CAT50 spindle interface and a 1-8 drawbar thread. Supports through-spindle and DIN flange coolant configurations.

Installation Notes

Installation should be performed by a qualified CNC machinist or toolroom technician. Ensure the spindle is fully stopped and the machine is in a safe, locked-out state before mounting or removing the holder. Clean the CAT50 taper and spindle bore thoroughly before seating to prevent fretting and maintain TIR integrity. Torque the drawbar to the machining center manufacturer's specification — do not use an unspecified value.