WHAT IS A SCREW THREAD?
A screw thread often known as threads are the helical structures that are used to convert the rotational as well as linear movement. A screw thread is generally wrapped around a cone or cylinder in the helix form. The former is known as straight thread and the latter is called a tapered thread.
You should buy thread converters, as well as thread converter accessories from authorized dealers only.
The benefits of a screw thread depend on the lead. Lead is the linear distance that is traveled by the screw in one revolution. Along with this, in many cases, the lead of a screw thread is chosen such that the friction created by the screw thread can prevent the linear motion from being converted to the rotary. Because of this, the screw will not slip even after the linear force is applied.
APPLICATIONS OF SCREW THREAD
Here are some applications of screw thread which will let you know how much it is used in the market:
- Screw threads are majorly used for the fastening of the processes. Various fasteners such as wood screws, nuts, machine screws, bolts.
- Along with this, it is also used for connecting the threaded pipes as well as hoses to each other.
- It also assists in gear reduction through the worm drives.
- It helps in the linear movement of objects. This is done by converting the linear motion to the rotary motion. It is the same as the case of a micrometer.
- It also helps in moving the two objects linearly and simultaneously combining the two aforementioned functions, measuring the movement.
The applications of the screw thread can be summed up in the following two points:
- It helps in converting the rotary motion into linear motion.
- It assists in preventing the linear motion.
Standardization of the screw threads has been evolved from the eighteenth century in order to facilitate the compatibility between various users and manufacturers. The standardization process of screw threads is still going on. In some areas, still competing metric as well as inch-sized thread standards are widely used.
Generally, the standard threads are recognized by short letter codes such as UNC, M, etc. These shortcodes also behave as a prefix of the standardization designations of each thread. Additional product standards, then recognize the preferred thread sizes for nuts as well as screws. This is done in order to facilitate the compatibility between other tools and spanners.
- ISO standard threads
The most prevalent threads being used in the market are the ISO metric screw threads i.e. M. Moreover, the BSP threads i.e R, G are used for the various purposes of pipes.
In the year 1947, the International Organization for Standardization (ISO) standardized these threads.
- Other current standards
- Unified thread standard
- National pipe thread
- British Standard Whitworth
- British Standard pipe thread
- British association screw thread
- British standard for spark plugs
- British Standard Brass
- Glass packaging institute threads
- Power screw threads
- Royal Microscopical Society
DESIGN OF SCREW THREAD
Following mentioned are the components or parts of a screw thread:
Every matched pair of the screw threads whether be it internal or external. They can be described as female or male threads. This property of a thread is known as gender.
The helix of a thread can be turned around in two directions. This property of screw threads is known as handedness. Many of the threads are oriented and because of this threaded item also becomes oriented. When we see a thread from a point on the axis from the mid of the helix. When it is turned in a clockwise direction, then it seems to move away from the user. In the case, when we turn it in an anticlockwise direction. Then it seems to move forward to the user. This is often known as a right-hand thread (RH). This is so because it follows the right-hand grip rule. Moreover, threads that are oriented in the opposite direction are known as left-handed (LH).
The cross-sectional shape of a thread is generally known as threadform or form. It comes in various shapes such as triangular, square, trapezoidal, and other shapes. Sometimes, terms such as threadforms and forms refer to the all aspects which are taken together.
Talking about triangular threadforms, they are generally based on isosceles triangles. These are generally known as V-threads or vee-threads. This is so because the shape of the letter is V. For the V-threads of 60 degrees, the isosceles triangle becomes equilateral. Moreover, the buttress threads, the triangle is known as scalene. A V-thread in which there is no truncation is allowed is known as sharp V-thread
A screw thread can be created in many different ways which include traditional subtractive types, molding, casting, newer additive techniques, and combinations thereof. Keep these things in mind while you buy thread converter.