Accupro 772030 CAT40 End Mill Holder 3/8 Inch Through Coolant

Product Description

The ACCUPRO 772030 is a CAT40 taper shank end mill holder designed for use on CNC machining centers requiring precise tool retention and through-coolant capability. The holder accepts a 3/8 inch bore and features a 1-3/8 inch projection with a 1 inch nose diameter, giving the operator clearance control in tight fixturing situations. Total indicator runout (TIR) is rated at 0.0050 mm (0.000200 inch), supporting tight-tolerance milling operations. The through-coolant design is compatible with both through-spindle and DIN flange coolant delivery systems. Balanced to 30,000 RPM, this holder suits high-speed machining environments where vibration and runout directly affect surface finish and tool life.

This end mill holder is suited for use on CNC vertical and horizontal machining centers equipped with CAT40 spindles. It is commonly installed in job shops, aerospace, automotive, and general metalworking facilities where consistent tool projection and coolant delivery are required. The 5/8-11 drawbar and retention knob thread size matches standard CAT40 tooling conventions. A clamping depth of 1.3400 inches provides solid tool engagement for endmills with 3/8 inch shanks.

Key Features

• CAT40 taper shank for direct mounting in CAT40 spindle machines
• 3/8 inch bore diameter with 1.3400 inch clamping depth for secure endmill retention
• Through-coolant compatible via through-spindle and DIN flange delivery
• TIR of 0.0050 mm (0.000200 inch) for high-precision milling applications
• Balanced to 30,000 RPM for use in high-speed machining environments
• 5/8-11 drawbar and retention knob thread size per CAT40 standard

Compatibility

Designed for use with CAT40 spindle machining centers accepting 5/8-11 retention knobs. Compatible with through-spindle coolant systems and DIN flange coolant configurations.

Installation Notes

Installation should be performed by a qualified machinist or tooling technician. Power down and lock out the machine spindle before inserting or removing the holder. Use a torque wrench on the drawbar per the machine tool manufacturer specifications — do not over-tighten or use impact tools on the retention knob. Inspect the taper bore and holder taper for chips or contamination before seating the tool; even minor debris affects TIR and balance.