what are straight cut gears


What is a straight cut gear?

A straight cut gear is a gear wheel with straight teeth along its circumference. As opposed to helical or spur gears, these gears are best utilised in applications that need to transmit power at a right angle, for example gearboxes of certain automobiles.

Advantages of Straight Cut Gears

Straight cut gears have a number of advantages that make them preferable for some specific applications:

  • Smooth operation: Due to the lower contact pressure between the teeth, the teeth of the gear wheel experience less wear, resulting in smoother operation.
  • Higher power capacity: The contact pressure that is experienced is spread over a wider area when compared to helical or bevel gears, allowing them to transmit higher power.
  • Lower manufacturing costs: Straight cut gears are far simpler to manufacture when compared to helical, bevel or spur gears, resulting in lower costs.

Disadvantages of Straight Cut Gears

There are however some drawbacks which must be kept in mind:

  • Noise: Straight cut gear do create more noise when compared to helical or spur gears due to increased sliding at the contact zone.
  • Contact stress: Due to the geometry of the teeth, straight cut gears tend to experience higher contact stress when compared to spur or helical gears.
  • Limited speed range: Because of the higher contact forces, straight cut gears are limited to a certain speed range and are not well suited to high speed applications.


Straight cut gears are highly efficient and economical solutions for some applications which require power to be transmitted at right angles. They are preferred in some applications due to their lower cost, higher power capacity and quieter operation when compared to other gear types. Despite their advantages, they do suffer from higher contact stress and limited speed range, making them unsuitable for some applications.