Accupro CR06400000MSC MT4 MT6 Morse Taper Reducing Sleeve

Product Description

The ACCUPRO CR06400000MSC is a standard Morse taper reducing sleeve designed to adapt an MT6 outside taper to an MT4 inside taper on machine tool spindles and drill press quills. The sleeve is hardened and ground throughout for dimensional accuracy and long service life under repeated tool changes. It measures 8-9/16 inches overall length with a 3/8 inch projection. Weighing 7.54 pounds, it is built for demanding machine shop environments where precise taper seating is required. This sleeve is installed by machinists and tool room technicians to reduce spindle taper size and mount smaller tooling without adapter arbors.

This reducing sleeve is suited for use in manual and CNC machining operations where an MT6 spindle must accept MT4 tooling, such as drill chucks, end mill holders, or other standard Morse taper shanks. Typical applications include vertical mills, drill presses, and lathes equipped with MT6 spindle bores. It is a direct-fit shop accessory for production and maintenance machining where consistent taper engagement is critical to runout control and tool retention.

Key Features

• MT4 inside taper accepts standard MT4-shank tooling directly
• MT6 outside taper seats into MT6 spindle bores without modification
• Hardened and ground throughout for accurate seating and extended wear life
• 3/8 inch projection for positive tool ejection during drift-key removal
• 8-9/16 inch overall length provides full taper engagement depth

Compatibility

Designed as a standard reducing sleeve for machine tool spindles with an MT6 bore requiring MT4 tooling fitment. Consult spindle documentation to confirm taper size and projection clearance before installation.

Installation Notes

Installation is performed by machinists or tool room technicians. Power down and lock out the machine spindle before inserting or removing the sleeve. Clean both the spindle bore and the sleeve taper surfaces thoroughly to remove chips, oil, and debris before seating. Use a standard drift key through the spindle slot to eject the sleeve. Never strike the tooling or sleeve directly with a hammer, as this can damage the ground taper surfaces.