Accupro 775286 End Mill Holder NMTB40 3/8 Inch Through Coolant

Product Description

The ACCUPRO 775286 is an end mill holder designed for CNC machining centers and milling machines equipped with an NMTB40 taper spindle. It accepts end mills with a 3/8 inch shank and provides a 2.31 inch projection from the spindle nose. The nose diameter measures 1 inch. Built with through-coolant capability, this holder channels coolant directly through the tool to the cutting zone, improving chip evacuation and extending tool life in demanding material removal applications. A total indicator runout (TIR) of 0.0002 inch supports accurate, repeatable cutting. The drawbar thread size is 5/8-11.

This end mill holder is suited for production and job-shop environments running NMTB40-equipped vertical or horizontal machining centers. It is appropriate for applications where through-spindle coolant delivery is available and required, including deep-pocket milling, slotting, and profiling in ferrous and non-ferrous materials. Machinists and CNC setup technicians are the primary installers. The 2.31 inch projection provides clearance for standard end mill lengths without excessive overhang.

Key Features

• NMTB40 taper shank for direct spindle mounting on compatible machining centers
• 3/8 inch bore diameter accepts standard 3/8 inch shank end mills
• Through-coolant design with through-spindle coolant delivery
• 0.0002 inch TIR for precise, low-runout tool holding
• 2.31 inch projection suits standard end mill reach requirements
• 5/8-11 drawbar thread for secure spindle retention

Compatibility

Designed for use with NMTB40 taper spindle machining centers equipped with through-spindle coolant capability and a 5/8-11 drawbar thread.

Installation Notes

Installation is performed by a machinist or CNC setup technician. Power down and lock out the machine spindle before mounting or removing the holder. Ensure the spindle taper and holder taper are clean and free of chips or burrs before seating. Torque the drawbar to the machine manufacturer specification and verify coolant port alignment before starting the spindle.