Screw is the name given to the curved grooves on a smooth cylindrical or conical surface. Along the curved lines formed, the grooves opened on the cylinder in triangular, square or trapezoidal shapes at threshold intervals also form screw profiles.

Screws are a very important material as they form the threaded parts of the machines. Screws are divided into types according to their usage areas and shapes.

Screw Types

1. Triangle Screws

As the name suggests, triangular screws are screw types with a triangular head. Since the helical angles of triangular screws are small, their drop height is also small. The reason why triangular screws are this way is because they are quite tight. In this way, it is one of the most robust screws.

Triangular screws are also divided into two. These are metric and whitworth types. The most important difference between these types is due to the different angles. While the angle of metric screws is 60 degrees, whitworth has an angle of 55 degrees. In other words, to put it in shape, the threads of the metric screw are equilateral triangles, while whitworth screws are isosceles triangles.

Triangular screws have small helix angles. Small helix angles mean that the self-blocking of triangular screws increases. This is a factor that makes the screws resistant to impacts. There are also triangular screws with large helix angles. However, these types of screws are not connection screws but movement screws.

2. Trapezoidal Screws

The threads of trapezoidal screws have a truncated triangular shape. Thanks to this feature, the screws and nuts grip each other without leaving any gaps. This is an element that increases flexibility. Accordingly, trapezoidal screws are generally used as movement screws, not as fastening screws.

Since trapezoidal screws are gapless, they have a structure that can be easily dissolved. This is why trapezoidal screws are extremely useful for parts that need to be constantly disassembled and assembled.

The helix angles of trapezoidal screws are extremely large and the end angles are also very small. Therefore, the friction force between the threads is very low. As a result of these reasons, trapezoidal screws are preferred not as fastening screws but as movement screws.

3. Square Screws

Square screws, as the name suggests, are screws with a square outer profile. Square screws, just like trapezoidal screws, are not used as fastening screws but as driving screws. Because square screws cannot be tightened very well due to their shape. Since the thread surfaces of square screws are also extremely short, they cannot be tightened firmly.

The helix angles of square screws are also important in terms of self-blocking. Square screws with large helix angles are suitable for easy loosening. For this reason, it is useful to have small helix angles of square screws.

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