Accupro 775300 End Mill Holder NMTB40 1-1/4 Inch

Product Description

The ACCUPRO 775300 is an end mill holder designed for CNC machining centers and milling machines using the NMTB40 taper shank interface. It accepts end mills and cutting tools with a 1-1/4 inch bore and features through-coolant capability, allowing coolant to pass directly from the spindle to the cutting zone. The 3.69 inch projection and 2-1/2 inch nose diameter suit standard tooling setups where clearance and rigidity are both priorities. With a TIR of 0.0002 inches, this holder meets precision requirements for finish milling, profiling, and contour work. Licensed machinists and CNC operators install this holder as part of a modular tooling system.

This end mill holder is suited for use in vertical and horizontal machining centers equipped with NMTB40 spindle tapers. The through-spindle coolant design directs cutting fluid to the tool tip, supporting longer tool life and improved chip evacuation in ferrous and non-ferrous materials. The 5/8-11 drawbar thread provides secure retention in NMTB40-equipped machines. It is appropriate for production shops, job shops, and maintenance facilities running CNC milling operations where repeatable tool runout and coolant delivery at the cutting edge are required.

Key Features

• NMTB40 taper shank for direct spindle mount on compatible machining centers
• 1-1/4 inch bore accommodates standard end mill shank sizes
• Through-coolant design delivers fluid directly to the cutting edge via the spindle
• TIR of 0.0002 inches supports precision milling and finishing operations
• 2-1/2 inch nose diameter with 3.69 inch projection for standard tooling clearance
• 5/8-11 drawbar thread for secure spindle retention

Compatibility

Designed for use in CNC machining centers with NMTB40 taper spindles and 5/8-11 drawbar threads. No specific machine models were provided in the product data.

Installation Notes

Installation should be performed by a qualified machinist or CNC setup technician. Power down and lock out the machine spindle before inserting or removing any tool holder. Ensure the taper bore and holder taper are clean and free of chips or coolant residue before seating. Torque the drawbar to the machine manufacturer's specification using the appropriate wrench — do not over-tighten or use impact tools on the drawbar.