Accupro 775048 End Mill Holder CAT40 7/8 Inch Through Coolant

Product Description

The ACCUPRO 775048 is a CAT40 taper shank end mill holder designed for precision milling operations in CNC machining centers. It accepts a 7/8 inch bore and provides a 1.75 inch projection with a 1-15/16 inch nose diameter. Built with through-coolant capability, it supports both through-spindle and DIN flange coolant delivery, keeping cutting tools cooled and chips cleared during operation. With a TIR of 0.0002 inches and a balanced rating of 30,000 RPM, this holder is suited for high-speed, close-tolerance work. Licensed machinists and CNC setup technicians are the primary users.

This end mill holder fits CAT40-spindle machining centers used in production and job shop environments. The 5/8-11 drawbar thread is the standard for CAT40 tooling systems. The through-coolant design supports high-feed milling, deep-pocket operations, and applications where flood coolant alone is insufficient. It is appropriate for both roughing and finishing operations where runout control is critical.

Key Features

• CAT40 taper shank for compatibility with standard CAT40 spindles
• 7/8 inch bore diameter for common end mill shank sizes
• 1.75 inch projection for reach into workpiece features
• Through-coolant support via through-spindle and DIN flange coolant paths
• TIR of 0.0002 inches for precision runout control
• Balanced to 30,000 RPM for high-speed machining applications
• 5/8-11 drawbar thread — standard for CAT40 tooling

Compatibility

Designed for use with CAT40-spindle CNC machining centers equipped with through-spindle or DIN flange coolant delivery and a 5/8-11 drawbar thread.

Installation Notes

Installation should be performed by a qualified machinist or CNC setup technician with the spindle fully stopped and locked out. Use a torque wrench and the machine manufacturer's specified drawbar procedure when seating the holder. Inspect the taper shank and spindle bore for chips, nicks, or contamination before mounting, as surface irregularities directly affect runout. Verify coolant path sealing before resuming through-coolant operation.