Jacobs 30452N Morse Taper Extension Adapter MT3 MT4

Product Description

The JACOBS 30452N is a Morse taper extension adapter designed to connect tooling with an MT3 inside taper to a machine spindle or sleeve with an MT4 outside taper. Built from alloy steel and hardened and ground throughout, this adapter delivers consistent concentricity and durability in demanding machining environments. The overall length is 9.45 inches, with a body diameter of 1.42 inches and a projection of 4.41 inches. It is used by machinists and tool-room technicians to extend reach or adapt between taper sizes on drill presses, lathes, and milling machines.

This adapter is suited for metalworking applications where MT3 tooling - such as drill chucks, end mill holders, or live centers - must seat into an MT4 spindle or quill. The 4.41-inch projection allows clearance in setups where standard-length tooling would otherwise not reach the workpiece. Typical installation environments include job shops, production floors, and maintenance facilities operating manual or CNC equipment with MT4 spindles.

Key Features

• MT3 inside taper accepts standard MT3-shank tooling
• MT4 outside taper seats into MT4 spindles, quills, or sleeves
• Overall length of 9.45 inches with 4.41-inch projection for extended reach
• Hardened and ground throughout for consistent taper fit and long service life
• Alloy steel construction handles heavy drilling and boring loads
• Body diameter of 1.42 inches for rigid support

Compatibility

Designed as an OEM-style extension adapter for machine tools equipped with an MT4 spindle or quill that require MT3 inside taper tooling fitment.

Installation Notes

Installation is performed by qualified machinists or tool-room technicians. Before inserting or removing the adapter, power down and lock out the machine spindle in accordance with OSHA lockout/tagout procedures. Clean both the adapter tapers and the machine spindle bore thoroughly to remove chips, oil, and debris before seating; foreign material on the taper surfaces will cause runout. Use a taper drift of the correct size to remove the adapter - never strike the tooling directly.