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Internal spur gears, also known as ring gears, have the teeth cut into the inside diameter, with a smooth external surface. Internal gears provide a compact solution that delivers large speed reductions and reduced sliding wear action. Internal gears are widely used in light duty applications. When it's necessary to have two parallel shafts rotate in the same direction, internal gears eliminate the need for an idler gear.

Hi-Tech Gears can manufacture 1-10 internal spur gears in about a week with no surcharge.