Jacobs 30455DN MT4 to MT5 Morse Taper Extension Adapter

Product Description

The JACOBS 30455DN is a Morse taper extension adapter designed to increase reach in machine tool spindle applications. It accepts an MT4 inside taper and presents an MT5 outside taper, allowing technicians to extend tooling depth without changing the host spindle. The adapter measures 11.81 inches overall length with a body diameter of 1.89 inches and a projection of 5.39 inches. Constructed from alloy steel and hardened and ground throughout, it provides consistent concentricity and surface integrity under repeated use. Machinists and toolroom technicians working with drill presses, lathes, and milling machines install this type of adapter when additional spindle depth is required.

This adapter is suited for metalworking and machining operations where an MT4 spindle socket must interface with MT5 tooling or accessories. Typical applications include production drilling, reaming, and boring setups where standard taper reach is insufficient. The extension format makes it appropriate for deep-hole operations or installations requiring increased distance between the spindle face and the cutting tool. It is installed by qualified machine operators and toolroom technicians in both job shop and production environments.

Key Features

• MT4 inside taper to MT5 outside taper extension configuration
• 11.81 inches overall length for extended spindle reach
• 5.39 inch projection for deep-reach tooling applications
• 1.89 inch body diameter for rigidity under load
• Alloy steel construction, hardened and ground throughout for dimensional accuracy

Compatibility

Designed for use with machine tool spindles accepting MT4 inside tapers and tooling or accessories with MT5 shanks.

Installation Notes

Installation should be performed by a qualified machinist or toolroom technician with the machine powered down and locked out per applicable LOTO procedures. The taper mating surfaces should be clean and free of chips, oil, or burrs before seating the adapter. Do not force or hammer the adapter into the spindle beyond hand-fit seating. Verify runout with a dial indicator after installation before commencing any cutting operation.