Accupro 778900 NMTB40 to JT2 Taper Adapter

Product Description

The ACCUPRO 778900 is an NMTB-to-Jacobs taper adapter designed to connect a Jacobs Taper 2 (JT2) chuck to an NMTB40 spindle taper. It serves as a rigid interface between drill press or milling machine spindles and drill chucks, allowing trade machinists and tool room technicians to mount JT2 tooling on NMTB40-equipped machines. The adapter features a 0.69-inch projection and weighs 2.2 pounds. No coolant-through capability is included, making this a straightforward mechanical taper-to-taper conversion. This part ships as a single-unit package and is intended for production or maintenance machining environments.

This adapter is suited for use on vertical mills, drill presses, and machining centers with NMTB40 spindle connections where a JT2 chuck mount is required. It is a common solution in machine shops and maintenance facilities that run mixed tooling inventories and need a reliable, direct taper fit without modification. Installation requires no special tools beyond standard chuck installation practices.

Key Features

• NMTB40 outside taper for direct spindle engagement on NMTB40-equipped machines
• JT2 inside taper accepts standard Jacobs Taper 2 drill chucks
• 0.69-inch projection provides the standoff needed for proper chuck seating
• No coolant-through design keeps construction straightforward and robust
• Single-piece unit weighing 2.2 pounds for solid, vibration-resistant tool holding

Compatibility

Designed for use with NMTB40 spindle machines and JT2 drill chucks. No specific compatible model numbers were provided in the product data.

Installation Notes

Installation should be performed by a qualified machinist or tool room technician. Power down and lock out the machine spindle before mounting or removing any taper tooling. Taper surfaces should be clean and free of chips, oil, or burrs before seating the adapter to ensure full contact and prevent runout. Follow the machine manufacturer guidelines for draw bar torque and chuck retention.