Accupro 772070 End Mill Holder CAT40 3/4 Inch Bore

Product Description

The ACCUPRO 772070 is a CAT40 taper shank end mill holder designed for use on CNC machining centers. It accepts a 3/4 inch bore and delivers a 4 inch projection from the spindle face, making it well suited for extended-reach milling operations. The holder features through-coolant capability, supporting both through-spindle and DIN flange coolant delivery. With a TIR of 0.0002 inches and a balance rating of 30,000 RPM, it is built for high-speed, precision milling applications. A 1-3/4 inch nose diameter and 1.77 inch clamping depth provide secure tool retention. Machinists and CNC operators install this holder as part of the spindle tooling assembly.

This end mill holder is intended for use in CNC machining centers equipped with CAT40 spindle interfaces. The 4 inch projection suits applications where clearance is needed around fixtures or workpiece features. Through-coolant support is beneficial in high-speed cutting of ferrous and non-ferrous materials where heat management and chip evacuation are priorities. The 5/8-11 retention knob thread size is standard for CAT40 tooling setups. It is appropriate for production environments and job shops running vertical or horizontal machining centers.

Key Features

• CAT40 taper shank for compatibility with standard CNC machining center spindles
• 3/4 inch bore diameter with 1.77 inch clamping depth for secure end mill retention
• 4 inch projection for extended-reach milling applications
• Through-coolant design supports through-spindle and DIN flange coolant delivery
• TIR of 0.0002 inches for precise, repeatable tool runout
• Balanced to 30,000 RPM for high-speed machining operations

Compatibility

Designed as an OEM-style toolholder for CNC machining centers with CAT40 spindle interfaces using a 5/8-11 retention knob thread size.

Installation Notes

Installation should be performed by a qualified CNC machinist or tooling technician with the spindle fully powered down and locked out per facility lockout/tagout procedures. Ensure the taper and spindle bore are clean and free of chips or debris before seating the holder. Verify retention knob torque specifications against the machine tool manufacturer guidelines before use. Confirm coolant passages are clear and sealed correctly when through-coolant operation is required.