Value Collection SC00187435 MT4 to MT3 Morse Taper Extension

Product Description

The VALUE COLLECTION SC00187435 is a Morse taper extension adapter used in machining operations to extend the reach of tools mounted on MT3 spindles or quills. The adapter accepts an MT4 inside taper and presents an MT3 outside taper, allowing technicians to seat MT3-shank tooling deeper in a machine spindle without modifying the machine. Overall length is 9.5 inches. The body is medium carbon steel, hardened and ground throughout, providing consistent taper geometry and surface finish for reliable tool seating and accurate concentricity under cutting loads.

This adapter is suited for drilling, boring, and reaming applications on drill presses, milling machines, and lathes equipped with MT3 spindle receivers. It is a practical solution when standard tool length is insufficient for deep-hole work or when fixture geometry requires additional clearance between the spindle face and the workpiece. Machinists and toolroom technicians are the primary installers.

Key Features

• MT4 inside taper accepts MT4-shank tooling or arbors
• MT3 outside taper seats into any standard MT3 spindle receiver
• 9.5-inch overall length extends tool reach for deep-hole and clearance applications
• Medium carbon steel construction hardened and ground throughout for precision fit and durability
• Consistent taper geometry supports accurate tool alignment and minimal runout

Compatibility

Designed for use with MT3 spindle machines and MT4-shank tooling. Compatible with standard Morse taper tooling and machine spindles conforming to MT3 and MT4 specifications.

Installation Notes

Power down and lock out the machine before installing or removing any taper adapter. Clean both the spindle bore and the adapter taper with a lint-free cloth to remove chips, oil, and grit before seating — contamination on the taper surfaces will cause misalignment and runout. Drive the adapter firmly into the spindle using a rubber or dead-blow mallet; never use a steel hammer directly on the taper. Remove the adapter with a taper drift inserted through the spindle drift slot to avoid damage to the taper surfaces.