Why is there such a difference between nuts and screws

There is a difference between nuts and screws, mainly due to their different functions and roles in mechanical connections. The following is a specific analysis of the reasons for the difference between nuts and screws:
1、 Differences in Function and Function
screw
Function: Screws are mainly used to tightly fix two or more objects together, ensuring that their relative position remains unchanged.
Function: The screw is tightened by mating its external thread with the internal threaded hole of the object or the thread of another screw, thereby fixing the object.
Nut
Function: Nuts are mainly used to connect screws and other components, increasing the stability of the connection by matching their internal threads with the external threads of the screws.
Function: The nut cooperates with the screw to make the connection more reliable and prevent the screw from loosening due to vibration, impact, and other factors.
2、 Differences in structure and shape
screw
Structure: Screws typically consist of a stem with external threads and a head for rotation and torque application.
Shape: Screws come in various shapes, including flat head, round head, hexagonal head, etc., to meet different installation needs and scenarios.
Nut
Structure: The nut is a metal block with internal threads, mostly hexagonal in shape, making it easy to rotate using tools such as wrenches.
Shape: The shape of nuts is relatively simple, but there are also various types, such as hexagonal nuts, round nuts, butterfly nuts, etc., to meet different fastening requirements and installation spaces.
3、 Differences in usage and installation
screw
Usage: Screws usually require the use of a screwdriver or power tool for rotation and tightening.
Installation: The screw can be directly screwed into the threaded hole inside the object or matched with the thread of another screw to achieve a tightening effect.
Nut
Usage: The nut needs to be rotated and tightened using tools such as wrenches and sockets.
Installation: The nut needs to be used in conjunction with the screw. Usually, the screw is first threaded through the connected object, and then the nut is tightened to make the connection more stable.
4、 Adapt to differences in scenarios and needs
screw
Adaptation scenarios: Screws are suitable for scenarios that require fixing the position and shape of objects, such as furniture manufacturing, machinery manufacturing, construction, and automotive manufacturing.
Requirement: Screws need to meet different requirements for fastening force, corrosion resistance, and strength to adapt to different usage environments and needs.
Nut
Adaptation scenario: Nuts are commonly used in fields such as large building structures, automobiles, and machinery manufacturing to fasten large components or gather multiple small threaded structures.
Requirement: The nut needs to have sufficient strength and corrosion resistance to ensure the stability and reliability of the connection. At the same time, nuts also need to adapt to different installation spaces and requirements. For example, hex nuts are easy to rotate using tools such as wrenches, while butterfly nuts are easy to operate in narrow spaces.
In summary, the differences between nuts and screws are mainly due to their different functions and roles in mechanical connections, structures and shapes, usage and installation methods, as well as their adaptability to different scenarios and requirements. These differences make nuts and screws play an irreplaceable role in their respective fields, together forming an indispensable and important component in mechanical connections.