# Angle of thread – Definition & Meaning

The angle of thread is a term that is commonly used in the field of engineering and manufacturing. It refers to the angle formed by the helix of a screw thread around its axis. This angle is important because it affects the strength and stability of the screw, as well as its ability to hold and distribute loads.

## Definitions

The angle of thread is defined as the angle between the helix and a plane perpendicular to the axis of the screw. It is measured in degrees or radians and is usually denoted by the Greek letter alpha (α). The angle of thread is one of the key parameters that determine the performance of a screw, along with the pitch, diameter, and thread form.

## Origin

The concept of the angle of thread dates back to the early days of screw manufacturing, when craftsmen and engineers were experimenting with different thread forms and geometries. It was first described in detail by the French mathematician and engineer, Augustin-Louis Cauchy, in the early 19th century.

## Meaning in different dictionaries

The angle of thread is defined in various technical dictionaries and reference works, including the Oxford English Dictionary, the McGraw-Hill Dictionary of Scientific and Technical Terms, and the Merriam-Webster Dictionary. In general, these sources define the angle of thread as the inclination of the helix of a screw thread to a plane perpendicular to the axis of the screw.

## Associations

The angle of thread is associated with a number of other important concepts in the field of screw manufacturing and engineering, including pitch, lead, thread form, and thread angle. These parameters all play a role in determining the performance and functionality of a screw, and are closely related to one another.

## Synonyms

Some synonyms for the angle of thread include helix angle, thread angle, and screw angle. These terms are often used interchangeably in technical literature and discussions about screw design and manufacturing.

## Antonyms

There are no true antonyms for the angle of thread, as it is a specific and well-defined concept in the field of engineering and manufacturing. However, some related terms that are sometimes used in contrast to the angle of thread include pitch angle, lead angle, and flank angle.

## The same root words

The angle of thread is related to a number of other terms that share the same root words or etymology, including helix, spiral, and screw. These terms all refer to the curved, twisted shape of a screw thread, and are used to describe different aspects of its geometry and performance.

## Example Sentences

• The angle of thread on this screw is too steep, which is causing it to strip and fail under load.
• By adjusting the angle of thread on this bolt, we can improve its holding power and resistance to shear forces.
• The helix angle and pitch of a screw thread are closely related, and must be carefully balanced to achieve optimal performance.
• The angle of thread on a screw is just one of many factors that determine its overall strength and durability.