Boston Gear change gears are used primarily on machine tools to provide different cutting speeds while using a constant speed input. All Boston Gear change gears are manufactured with a double key to accept the compound steel bushings that connect two gears together, allowing them to spin on an intermediate shaft. The change gears we stock range from 20-tooth through 128-tooth gears, in one tooth increments, depending upon the diametral pitch, for a nearly infinite number of ratio possibilities. Be sure to ask for the Boston Gear compound steel bushings designed specifically for use with these gears.

• With 20 to 128 teeth, our change gears offer an almost infinite number of ratio possibilities.
• A PA of 14 1/2° ensures smooth, quiet operation.
• These change gears are available in both steel and cast iron to suit a variety of application requirements.
• Compound steel bushings specifically designed for these change gears are available to maximize performance.
• Boston Gear's change gears are available via our Guaranteed Same Day Shipment Program to ensure timely delivery.

• Machine tools
• Lathes
• Drill presses
• Feed drives
• Indexing machines