Accupro 772040 End Mill Holder CAT40 7/16 in Through Coolant

Product Description

The ACCUPRO 772040 is a CAT40 taper shank end mill holder designed for CNC machining centers requiring precise tool retention and through-coolant capability. With a 7/16 inch hole diameter, 2.5 inch projection, and 1.75 inch nose diameter, this holder accommodates end mills in high-speed applications up to 30,000 RPM. A total indicator runout (TIR) of 0.0002 inch supports tight-tolerance work where tool concentricity directly affects surface finish and tool life. Machinist and tooling specialists install this holder as part of a CAT40 tooling system on vertical and horizontal machining centers.

This holder fits production and job-shop environments running CAT40 spindle machines. The through-coolant design delivers cutting fluid directly to the tool tip, improving chip evacuation and heat management during deep-pocket milling, slotting, and extended-reach operations. The 1.5 inch clamping depth provides secure tool engagement across a range of end mill shank lengths. Coolant is supplied via through-spindle and DIN flange porting, making this holder compatible with machines equipped with either coolant delivery method.

Key Features

• CAT40 taper shank for positive spindle engagement on CAT40 machining centers
• 7/16 inch hole diameter with 1.5 inch clamping depth for secure end mill retention
• Through-coolant design supports both through-spindle and DIN flange coolant delivery
• Balanced to 30,000 RPM for high-speed machining applications
• TIR of 0.0002 inch for tight concentricity tolerances
• 5/8-11 drawbar and retention knob thread size for standard CAT40 pull studs

Compatibility

Designed for use in CAT40 spindle machining centers with through-spindle or DIN flange coolant systems. Accepts end mills with a 7/16 inch shank diameter. Retention knob thread size is 5/8-11, compatible with standard CAT40 pull studs.

Installation Notes

Installation should be performed by a qualified machinist or toolroom technician familiar with CAT40 tooling systems. Power down and lock out the machining center spindle before inserting or removing the holder. Use a calibrated torque wrench and the appropriate spanner or end mill holder wrench when securing the tool — do not overtighten the setscrews. Verify TIR with a dial indicator after assembly before returning the machine to production.