Accupro 778984 R8 to 3MT Morse Taper Adapter

Product Description

The ACCUPRO 778984 is an R8 to Morse Taper adapter designed to connect an R8 spindle taper to a 3MT (No. 3 Morse Taper) toolholder or accessory. This adapter features an R8 outside taper for direct mounting in compatible milling machine spindles and a 3MT inside taper to accept drill chucks, live centers, drill sleeves, or other Morse Taper tooling. The through-coolant design allows coolant flow from the spindle through the adapter, supporting wet-cutting operations where chip evacuation and tool life are priorities. Weighing 1 pound, this adapter is a compact interface component used by machinists and tool-room technicians in manual and CNC milling environments.

This adapter is suited for vertical milling machines and machining centers with R8 spindles that require 3MT tooling compatibility. Common applications include drilling, reaming, and boring operations where a 3MT drill chuck or sleeve must be seated in an R8-equipped machine. The through-coolant feature makes it a practical choice for production environments running continuous cutting cycles where flood or directed coolant is in use at the spindle interface.

Key Features

• R8 outside taper fits directly into R8 spindle bores
• 3MT inside taper accepts No. 3 Morse Taper toolholders, chucks, and sleeves
• Through-coolant passage supports wet-cutting and high-production machining
• Compact, single-piece adapter construction for rigid toolholder connection
• Lightweight at 1 pound for minimal added spindle load

Compatibility

Designed as an OEM-style adapter for vertical milling machines and machining centers equipped with R8 spindle tapers requiring No. 3 Morse Taper tooling interface.

Installation Notes

Installation is performed by qualified machinists or tool-room technicians. Power down and lock out the machine spindle before seating or removing the adapter. Ensure both the R8 spindle bore and the adapter taper surfaces are clean and free of chips or burrs before installation to maintain proper seating and concentricity. Do not use impact force to drive the adapter; use the drawbar or standard R8 retention method per the machine manufacturer's procedure.