Accupro 771036 CAT40 End Mill Holder 5/8 Inch Bore

Product Description

The ACCUPRO 771036 is a CAT40 dual contact taper shank end mill holder designed for precision tool retention in CNC machining centers. It accepts a 5/8 inch bore and provides 4 inches of projection with a 1-21/32 inch nose diameter. The dual contact taper shank engages both the taper and the spindle face simultaneously, improving rigidity and reducing runout compared to standard single-contact holders. Through-coolant capability supports both through-spindle and DIN flange coolant delivery. With a TIR of 0.0002 inches and a balance rating of 30,000 RPM, this holder suits high-speed finishing and precision profiling operations. It is installed and maintained by CNC machinists and toolroom technicians.

This holder is suited for vertical and horizontal machining centers equipped with CAT40 spindles. The 4 inch projection makes it appropriate for applications requiring clearance from the spindle face, including deep-pocket milling and contour work. Through-coolant compatibility supports chip evacuation and tool life in ferrous and non-ferrous cutting applications. The 5/8-11 retention knob thread size is standard for CAT40 tooling systems. Clamping depth is 1.61 inches, providing secure tool engagement for heavy interrupted cuts or continuous high-feed passes.

Key Features

• CAT40 dual contact taper shank engages taper and spindle face for improved rigidity
• 5/8 inch bore diameter with 1.61 inch clamping depth
• 4 inch projection for clearance in deep-pocket and contour applications
• Through-coolant compatible via through-spindle and DIN flange delivery
• TIR of 0.0002 inches for precise, repeatable tool positioning
• Balanced to 30,000 RPM for high-speed machining operations

Compatibility

Designed for use in CAT40 spindle machining centers. Retention knob thread size is 5/8-11, standard for CAT40 tooling. Accepts 5/8 inch shank end mills and compatible round-shank cutting tools.

Installation Notes

Installation and tool changes should be performed by qualified CNC machinists or toolroom personnel with the spindle powered down and locked out per facility LOTO procedures. Use a calibrated torque wrench and the appropriate end mill holder wrench when clamping the set screw to avoid galling or over-torquing the bore. Inspect the taper shank and spindle taper for chips, nicks, or contamination before seating the holder. Verify TIR with a dial indicator after installation before beginning any cutting operation.