Threaded Screws

A screw thread, often shortened to thread, is a helical structure used to convert between rotational and linear movement or force. A screw thread is a ridge wrapped around a cylinder or cone in the form of a helix, with the former being called a straight thread and the latter called a tapered thread.

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Detailed Description for Threaded Screws

The helix of a thread can twist in two possible directions, which is known as handedness. Most threads are oriented so that the threaded item, when seen from a point of view on the axis through the centre of the helix, moves away from the viewer when it is turned in a clockwise direction, and moves towards the viewer when it is turned counter clockwise. This is known as a right-handed (RH) thread, because it follows the right hand grip rule. Threads oriented in the opposite direction are known as left-handed (LH).

The cross-sectional shape of a thread is often called its form or thread form (also spelled thread form). It may be square, triangular, trapezoidal, or other shapes. The terms form and thread form sometimes refer to all design aspects taken together (cross-sectional shape, pitch, and diameters).

Most triangular thread forms are based on an isosceles triangle. These are usually called V-threads or vee-threads because of the shape of the letter V. For 60° V-threads, the isosceles triangle is, more specifically, equilateral. For buttress threads, the triangle is scalene.

The theoretical triangle is usually truncated to varying degrees (that is, the tip of the triangle is cut short). A V-thread in which there is no truncation (or a minuscule amount considered negligible) is called a sharp V-thread. 

Screw threads have several applications:

·         Fasteners such as wood screws, machine screws, nuts and bolts.

·         Connecting threaded pipes and hoses to each other and to caps and fixtures.

·         Gear reduction via worm drives

·         Moving objects linearly by converting rotary motion to linear motion, as in the leadscrew of a jack.

·         Measuring by correlating linear motion to rotary motion (and simultaneously amplifying it), as in a micrometer.

·         Both moving objects linearly and simultaneously measuring the movement, combining the two aforementioned functions, as in a leadscrew of a lathe.

In all of these applications, the screw thread has two main functions:

·         It converts rotary motion into linear motion.

·         It prevents linear motion without the corresponding rotation.

 

 


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