Tuesday, October 3, 2023

Bolt Vs Screw | What is Bolt? | What is Screw? | Bolt and Screw

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In this article, we will discuss Bolt Vs Screw.


  1. What is Screw?  

A screw may be described as an inclined plane covered about a nail and characterized by a helical ridge. In other words, it is a prolonged metal shaft with threads rotating along its length. It also contains a turning where a screwdriver can turn the screw.

A screw typically contains a head with a specially developed shape. The shape decides, and the head size is the tool for turning or driving the screw.

Typically employed tools are wrenches and screwdrivers. The underside of the head is a shank that can be entirely or partially threaded.

A screw thread is a design on a coned or cylindrical shape in the shape of a helix. The top of the ridge is known as a crest, and the bottom root.

The distance between the crest of one thread and the next is known as a pitch. Screws are tightened by curling the tool anticlockwise or clockwise and are employed for joining materials that don’t own existing holes.

The most typical types of screws employed in manufacturing are drywall screws, dowel screws, mirror screws, and concrete screws. The power of a screw relies on the width of the thread and the distance between them.

However, the higher the number of threads, the more rotations needed to connect the screw. Also, if the ongoing distance thread is more comprehensive, more force must be exercised on the tool in the rotations.

Screws are commonly employed in various applications, from cycles to metal, irrigation to transportation.


Bolt and Screw





  2. What is Bolt?  

A bolt is an externally threaded fastener made for the insertion through holes in the completed parts.

Commonly, bolts are planned to be released by nuts. These bolts are in a uniform circular cross-section; the threads are spiral in design and possess a smaller pitch than screws.

These bolts don’t have tapered shanks, and the parts connected by bolts possess higher strength than regions connected by screws.

These bolts work on the application together with the nut and are tightened on the part where the torque is involved.

Some of the majorly employed bolts are as follows:

a. Plow bolts

b. Carriage bolts, and

c. Track bolts


The dependability and life span of components joined by bolts is much higher than those hooked by screws. They are typically utilized in applications such as fastening metal objects or joining flange joints.

Moreover, bolts aren’t just employed in machinery, plumbing, and electronics. Z Bolts are an essential part of equipment and component reliability.


Bolt Pretension

Bolt Preload:

The tension is prepared when the nut is screwed onto a bolt to bear two materials jointly.

When the tension obtains the optimal preload, the working load (load provided after making the assembly) placed on a bolt will be spread into the installation materials so the bolt does not carry the whole load.





  3. Bolt Vs Screw: Difference Between Bolt and Screw  

The difference between Bolt and Screw is mentioned below:

S.No Screw  Bolt
1 Screw takes no nut. Bolt takes a nut on one side.
2 A screw is placed without any holes. Holes are needed for placing the bolt.
3 The screw is employed with thread elements. Holes are employed to assemble elements.
4 It is called a full thread. It is called a half thread.
5 It includes a thread that is spiral in shape. It includes a thread that is spiral in shape.
6 The screw includes a pointed shank. It doesn’t own any decreased shank.
7 It owns no parallel section. It owns a parallel section.
8 It provides less strength. Bolt provides greater strength.
9 In a screw, torque is used to the head. In a bolt, torque isn’t used to the thread.
10 The screw needs to be turned. That’s why it does not remain in the same place. It is placed in a single position.
11 It owns no external thread except one head. It owns an external thread at the lower end.
12 The screw requires a screwdriver most of the time for tightening. It requires wrenches and spanners for tightening.
13 It is less reliable. It is more dependable.
14  A screw is employed to tighten the material by digging in. It is designed for insertion through holes in assembled components.
15 Available sizes of the screw are small or medium. They don’t give any large sizes. Available sizes of the bolt are small or large. They don’t give medium size.
16 Some instances of screws are- wood machine screws, self-drilling screws, mating screws, set screws, etc. Some instances of bolts are- elevator bolts, lag bolts, timber bolts, stud bolts, plow bolts, etc.
17 It owns a non-uniform cross-connection. It owns a uniform-cross section.


This was for the Bolt Vs Screw.



  4. References  

1. Content Filter & Authenticity Checking Team, Dream Civil International

(Our team checks every content & detail to maintain quality.)




Read Also: Type of Roofing Sheets


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Er. Madhu Krishna Poudel
Er. Madhu Krishna Poudel
He is a founder and lead author of Dream Civil International and his civil engineering research articles has been taken as source by world's top news and educational sites like USA Today, Time, The richest, Wikipedia, etc.
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