Accupro 775326 End Mill Holder NMTB50 1 Inch Bore

Product Description

The ACCUPRO 775326 is an end mill holder designed for CNC machining centers and milling machines equipped with an NMTB50 taper spindle. It accepts end mills with a 1-inch bore diameter and delivers a 3.1-inch projection from the spindle face, providing clearance for a wide range of milling operations. The 2-3/8-inch nose diameter supports solid tool clamping, while through-coolant capability directs cutting fluid directly to the tool tip. With a total indicator runout (TIR) of 0.0002 inch, this holder supports accurate, repeatable cuts in production and job-shop environments. It is suited for machinists and tool room technicians working with standard NMTB50 tooling systems.

The ACCUPRO 775326 is used in vertical and horizontal machining centers fitted with NMTB50 spindle interfaces. The 1-inch bore accommodates standard 1-inch shank end mills used in ferrous and non-ferrous material removal. The through-coolant design makes it well suited for applications where heat management and chip evacuation at the cutting zone are priorities, including deep-pocket milling and high-feed operations. The 1-8 drawbar thread connects the holder securely to the machine spindle.

Key Features

• NMTB50 taper shank for direct spindle mounting on compatible machining centers
• 1-inch bore diameter accepts standard 1-inch shank end mills
• 3.1-inch projection provides clearance for workpiece features and fixturing
• Through-coolant construction routes cutting fluid through the spindle and holder to the tool tip
• TIR of 0.0002 inch supports dimensional accuracy and tool life
• 1-8 drawbar thread for secure retention in the spindle

Compatibility

Designed as a direct-mount tool holder for machining centers with NMTB50 taper spindles and a 1-8 drawbar thread. Accepts end mills and cutting tools with a 1-inch straight shank.

Installation Notes

Installation and removal should be performed by a qualified machinist or tooling technician with the machine powered off and the spindle fully stopped. Ensure the taper bore of the spindle and the holder taper are clean and free of chips or burrs before seating the holder. Torque the drawbar according to the machine tool manufacturer specifications for NMTB50 tooling. Verify coolant lines are properly connected before enabling through-coolant flow.