Value Collection SC00187138 MT1 to MT3 Taper Extension Adapter

Product Description

The VALUE COLLECTION SC00187138 is a Morse taper extension adapter designed to extend reach between machine spindles and tooling. It accepts an MT1 inside taper and presents an MT3 outside taper, allowing a smaller-shank tool to be used in a larger-taper spindle with added length. The overall length is 6-7/8 inches. The adapter is constructed from medium carbon steel and is hardened and ground throughout, providing the dimensional accuracy and surface hardness required for reliable taper seating under cutting loads. Machinists and toolroom technicians install this type of adapter in drill presses, lathes, and milling machines.

This adapter suits applications where an MT1-shank tool such as a drill bit, reamer, or arbor must be mounted in a machine spindle that accepts an MT3 taper. The added length is useful when workpiece geometry or fixture height requires extended reach beyond what a standard direct-mount adapter provides. It is appropriate for use in light-to-medium machining operations on manual machine tools in job shop, maintenance, and production environments.

Key Features

• MT1 inside taper accepts standard MT1-shank tooling
• MT3 outside taper seats directly in MT3-compatible spindles and tailstocks
• 6-7/8 inch overall length provides extended reach for deep-reach applications
• Medium carbon steel construction with hardened and ground finish throughout for accurate taper geometry
• Hardened surface resists wear and maintains taper concentricity over repeated tool changes

Compatibility

Designed for use with machine tool spindles and tailstocks that accept an MT3 outside taper, and compatible with any tooling carrying a standard MT1 shank.

Installation Notes

Installation is performed by machinists or toolroom technicians. Power down and lock out the machine before seating or removing any taper adapter. Clean both the spindle bore and the adapter taper surfaces thoroughly before installation to ensure full taper contact and prevent fretting. Use a taper drift and soft mallet to eject the adapter from the spindle — never strike the tooling directly.