Collis Tool 67842 End Mill Holder CAT50 5/8 Inch Bore

Product Description

The COLLIS TOOL 67842 is a CAT50 taper shank end mill holder engineered for precision milling applications in CNC machining centers. It accepts a 5/8 inch bore and delivers a 3.75 inch projection from gauge line to tool tip, giving operators the clearance needed for deeper-reach operations. The nose diameter measures 1-5/8 inches. Through-coolant capability routes cutting fluid directly to the tool tip, supporting chip evacuation and extended tool life in demanding cutting conditions. A total indicator runout (TIR) of 0.0002 inches ensures the tight concentricity that high-speed milling operations require. This holder is installed and serviced by CNC machinists and toolroom technicians.

This end mill holder is suited for use in vertical and horizontal machining centers equipped with CAT50 spindle interfaces. It is a practical choice for shops running production milling, die and mold work, or general-purpose machining where coolant-through tooling is a standard requirement. The through-spindle coolant path makes it compatible with machines that supply coolant through the drawbar or spindle. The 9/16-18 drawbar thread is a standard size for CAT50 tooling systems.

Key Features

• CAT50 taper shank for positive engagement in CAT50 spindle interfaces
• 5/8 inch bore diameter accommodates standard end mill shanks
• 3.75 inch projection for extended reach in deep-cavity milling
• Through-coolant design routes fluid directly to the cutting zone
• TIR of 0.0002 inches for high concentricity and reduced runout
• 9/16-18 drawbar thread matches standard CAT50 retention hardware

Compatibility

Designed for use in machining centers with CAT50 spindle interfaces that support through-spindle coolant delivery. Compatible with 5/8 inch shank end mills and other round-shank cutting tools of matching diameter.

Installation Notes

Installation and removal should be performed by a qualified CNC machinist or toolroom technician using an appropriate tool holding fixture or bench vise block - never grip the taper directly in a standard vise. Power down and lock out the machine spindle before inserting or removing the holder. Verify drawbar engagement and torque the retention knob to the machine manufacturer's specification before spindle operation. Inspect the taper and bore for nicks, chips, or contamination before seating the holder.