Accupro 772178 End Mill Holder CAT50 1 Inch Hole

Product Description

The ACCUPRO 772178 is a CAT50 taper shank end mill holder designed for use in CNC machining centers where secure tooling and precise runout control are critical. It accepts a 1 inch bore diameter and delivers a 4 inch projection from the spindle face, making it suitable for applications requiring extended reach. The holder features through-coolant capability, supporting both through-spindle and DIN flange coolant delivery. With a total indicated runout (TIR) of 0.0002 inches, it is built for operations where dimensional accuracy and surface finish are priorities. The unit weighs 9.2 pounds and measures 8 inches in overall length.

This holder is intended for use in production and job-shop machining environments running CAT50-equipped vertical or horizontal machining centers. It is installed by machinists and tool crib personnel setting up end milling operations in ferrous and non-ferrous material cutting. The 2-23/64 inch nose diameter and 2.36 inch clamping depth provide a stable grip on standard shank end mills. The holder is balanced to 25,000 RPM, making it appropriate for high-speed machining applications where vibration and tool runout directly affect part quality and insert life.

Key Features

• CAT50 taper shank for compatibility with standard CAT50 spindle interfaces
• 1 inch bore diameter with 2.36 inch clamping depth for secure end mill retention
• 4 inch projection for extended reach milling setups
• Through-coolant support via through-spindle and DIN flange coolant types
• TIR of 0.0002 inches for high-precision runout performance
• Balanced to 25,000 RPM for high-speed machining center use

Compatibility

Designed as an OEM-style toolholder for CAT50 spindle machining centers accepting standard 1 inch shank end mills with a 1-8 retention knob thread size.

Installation Notes

Installation should be performed by a qualified machinist or tool crib technician with the machine in an e-stopped and locked-out state per applicable machine tool safety procedures. Verify spindle cleanliness and taper condition before seating the holder. Use a torque wrench and the correct retention knob specification for the target spindle; do not over-tighten the drawbar. Confirm runout at the bore before production use.