Internal Gears
Spur Gears & Rack
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Gear Theory

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Boston Gear's internal gears are spur gears turned "inside out." In other words, the teeth are cut into the inside diameter while the outside diameter is kept smooth. This design allows for the driving pinion to rotate internal to the gear, which, in turn, allows for clean operation. Intended for light duty applications, these gears are available only in brass. When choosing a mating spur gear, always remember that the difference in the number of teeth between the internal gear and pinion should not be less than 15 (14 1/2° PA) or 12 (20° PA).

Features and Benefits

  • Available in 14 1/2° and 20° PA, our internal gears are designed to accommodate a wide range of equipment.
  • Manufactured from brass, these gears are ideal - and cost-effective - for a broad range of light-duty applications.
  • Their non-binding tooth design ensures smooth, quiet operation.

Sample Applications

  • Light duty applications
  • Timing
  • Positioning
  • Rollers
  • Indexing


© Boston Gear 2003