Accupro CR03100000MSC MT1 to MT3 Taper Reducing Sleeve

Product Description

The ACCUPRO CR03100000MSC is a standard Morse taper reducing sleeve designed to adapt an MT1 inside taper to an MT3 outside taper on drill presses, lathes, milling machines, and similar machine tool spindles. The sleeve measures 3.875 inches overall length with a 0.25 inch projection and is hardened and ground throughout for precise, repeatable tool holding. This type of adapter is a fundamental shop accessory used by machinists and tool-and-die professionals to mount smaller-shank tooling into larger-taper spindles without sacrificing alignment or concentricity.

This reducing sleeve is suited for machine shop environments where MT1-shank tooling such as small drill chucks, center drills, or reamers must be seated in an MT3 spindle or tailstock. Typical applications include manual lathes, bench drill presses, and vertical milling machines equipped with MT3 spindles. The hardened and ground construction makes it appropriate for production and maintenance machining operations where surface finish and fit consistency matter.

Key Features

• MT1 inside taper accepts standard MT1-shank tooling
• MT3 outside taper seats directly in MT3 spindles and tailstocks
• Hardened and ground throughout for precise fit and long service life
• 0.25 inch projection for positive tool ejection
• 3.875 inches overall length suits standard machine tool spindle depths
• Lightweight at 0.49 pounds for easy handling and tool changes

Compatibility

Designed as an OEM-style reducing sleeve for machine tool spindles and tailstocks with an MT3 outside taper bore, accepting tooling with an MT1 shank.

Installation Notes

Installation is performed by qualified machinists or toolroom technicians. Before inserting or removing the sleeve, power down and lock out the machine spindle per OSHA lockout/tagout procedures. Clean both the sleeve exterior and the spindle bore with a lint-free cloth to remove oil, chips, and debris before seating, as contamination will compromise taper fit and concentricity. Use a drift rod through the spindle drift slot to eject the sleeve cleanly; never strike the tooling itself to free a stuck taper.