Value Collection 214-8134 MT3 Inside MT4 Outside Reducing Sleeve

Product Description

The VALUE COLLECTION 214-8134 is a standard Morse taper reducing sleeve designed to adapt an MT3 inside taper to an MT4 outside taper. Hardened and ground throughout, this sleeve provides a precise, rigid connection between tooling and machine spindles in lathe, drill press, and milling machine applications. It measures 240mm in overall length with a 36mm body diameter and a 3/4 inch projection. The hardened and ground construction ensures accurate taper alignment and long service life under repeated tool changes. Machinists, toolroom technicians, and machine shop operators use this sleeve to mount MT3-shank tooling in MT4 spindles without spindle modification.

This reducing sleeve is suited for use in machine tools equipped with an MT4 spindle where MT3-taper tooling — such as drill chucks, end mill holders, or center sleeves — must be seated securely. It is appropriate for both manual and CNC-adjacent toolroom setups where taper adapters are used to extend tooling range. The hardened and ground finish makes it a reliable choice in production and maintenance environments where dimensional consistency matters.

Key Features

• MT3 inside taper adapts MT3-shank tooling to MT4 spindle machines
• Hardened and ground throughout for precise taper fit and extended service life
• 240mm overall length accommodates deep spindle reach requirements
• 36mm body diameter provides stable engagement within the MT4 socket
• 3/4 inch projection for positive tool seating and ejection clearance

Compatibility

Designed as a standard reducing sleeve for machine tool spindles with an MT4 inside taper, accepting tooling with an MT3 outside taper shank.

Installation Notes

Installation is performed by qualified machinists or toolroom technicians. Before inserting the sleeve, power down and lock out the machine per OSHA lockout/tagout procedures. Clean both the spindle bore and the sleeve exterior thoroughly — any debris on the taper surfaces will compromise alignment and can cause tooling to slip under load. Seat the sleeve firmly by hand and confirm full taper contact before resuming machine operation. Use a taper drift through the spindle ejector slot to remove the sleeve; never strike the tooling directly to dislodge it.