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Gears are categorized into several types. They are classified under several sub-categories, according to their applications, properties, material used and the position of axes. According to the relative position of the axes of revolution, gears are classified into following categories:
Gear types grouped according to axel positioning or shaft arrangement
| Parallel Axes | Intersecting Axes | Non-Intersecting (Non-parallel) Axes |
| Spur Gears | Bevel gears | Hypoid gears |
| Helical Gears | Straight bevel | Crossed helical gears |
| Herringbone or double helical gears | Zerol bevel | Worm gears |
| - | Spiral bevel | - |