Collis Tool 68207 End Mill Holder CAT40 3/4 Inch Bore

Product Description

The COLLIS TOOL 68207 is a CAT40 taper shank end mill holder designed for secure tool retention on vertical and horizontal machining centers. It accepts a 3/4 inch bore and delivers a 1.375 inch projection from the gauge line to the nose, keeping the cutting tool close to the spindle for improved rigidity. The 1-3/4 inch nose diameter provides a solid clamping surface. With a TIR of 0.0002 inch and a balance rating of 20,000 RPM, this holder suits high-speed finishing and general milling operations where runout control matters. Machinists and CNC setup technicians are the primary users.

This end mill holder is suited for CNC machining centers running CAT40 tooling systems. The short 1.375 inch projection makes it well matched for rigid roughing cuts or precision finishing passes where tool overhang must be minimized. The 5/8-11 drawbar thread engages standard CAT40 spindle retention knobs. It is a common choice on vertical machining centers in job shops, tool rooms, and production environments requiring reliable, repeatable tool holding.

Key Features

• CAT40 taper shank for direct spindle mounting on compatible machining centers
• 3/4 inch bore diameter for standard end mill shanks
• 1.375 inch projection for reduced overhang and improved rigidity
• TIR of 0.0002 inch for consistent runout control at high speeds
• Balanced to 20,000 RPM supporting high-speed machining applications
• 5/8-11 drawbar thread compatible with standard CAT40 retention hardware

Compatibility

Designed for use with CAT40 spindle tooling systems. Compatible with 3/4 inch shank end mills. Requires a 5/8-11 retention knob for spindle clamping. Through-coolant is not supported by this holder.

Installation Notes

Installation should be performed by a qualified machinist or CNC technician with the spindle fully powered down and locked out. Use a torque wrench on the drawbar only to the machine manufacturer's specified value - do not over-torque. Inspect the taper bore and spindle taper for chips or contamination before seating the holder. Verify runout with a test indicator after installation before beginning any cutting operation.