Accupro 772138 End Mill Holder CAT50 1/2 Inch Through Coolant

Product Description

The ACCUPRO 772138 is a CAT50 taper shank end mill holder designed for CNC machining centers requiring secure tool retention and integrated coolant delivery. The holder accepts a 1/2 inch shank end mill and provides 4 inches of projection from the spindle face, placing the cutting tool at the correct reach for a wide range of milling operations. A 1-3/8 inch nose diameter and 1-1/2 inch clamping depth provide rigid grip on the tool shank. Through-spindle and DIN flange coolant capability allows coolant to be delivered directly to the cutting zone, reducing heat buildup and extending tool life. Total indicator runout (TIR) is rated at 0.0002 inches, supporting precision work where concentricity matters.

This holder is intended for use on CNC vertical and horizontal machining centers equipped with CAT50 spindles. It is suited to production environments running ferrous and non-ferrous materials where through-coolant delivery is required. The 25,000 RPM balance rating makes it appropriate for high-speed finishing and semi-finishing operations. The 1-8 retention knob thread size is standard for CAT50 tooling. Installation and tool changes are performed by machinists and CNC setup technicians as part of routine tooling changeover.

Key Features

• CAT50 taper shank for positive spindle engagement on compatible machining centers
• 1/2 inch bore diameter accepts standard 1/2 inch shank end mills
• 4 inch projection provides reach for deep-cavity and extended-reach milling setups
• Through-spindle and DIN flange coolant delivery directs fluid to the cutting edge
• 0.0002 inch TIR for high-concentricity tool holding
• Balanced to 25,000 RPM for high-speed machining applications
• 1-1/2 inch clamping depth for secure tool retention

Compatibility

Designed for CNC machining centers with CAT50 spindle interfaces. Retention knob thread size is 1-8, standard for CAT50 tooling systems. No additional specific model compatibility data was provided in the product record.

Installation Notes

Tool holder installation should be performed by a qualified machinist or CNC setup technician following the machine tool builder's torque and retention specifications. Always power down and lock out the machining center spindle before installing or removing tooling. Verify that the taper surfaces on both the holder and spindle are clean and free of chips, oil film, or damage before seating the holder. Confirm retention knob engagement and through-coolant port alignment before returning the spindle to service.