请提供一个具有逻辑性的关于 linking pin 的解释，要求以英文原版的形态出现，且答案需做到3个要点，每个要点独立成段。另外，解释需简明且例子具体。请确保拼写和语法正确。
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A linking pin, also known as a cotter pin or a hinge pin, is a type of mechanical fastener used to secure two parts together in a way that allows for both secure connection and ease of disassembly. The primary function of a linking pin is to hold components in alignment, ensuring that the mechanical assembly functions as intended without unnecessary movement or wear. For instance, in bicycles, a linking pin is used to connect the pedal to the crank arm, allowing for smooth rotation while maintaining the structural integrity of the connection.

The design of a linking pin is straightforward yet effective. It typically consists of a cylindrical body with a pin or rod that is inserted through pre-drilled holes in the components it is intended to secure. Once inserted, the pin may be secured with a variety of methods, such as a cotter pin that spreads out to hold the shaft in place, or a spring-loaded mechanism that engages when the pin is fully inserted. An example of this is found in automotive suspension systems, where a linking pin is used to connect the control arm to the steering knuckle, ensuring that the suspension moves freely while keeping the wheel aligned.

Moreover, linking pins are often made from durable materials such as steel or stainless steel to withstand the stresses of dynamic environments. They are widely used in industries ranging from automotive and aerospace to heavy machinery and consumer goods. In the construction industry, for instance, linking pins are used in the hinges of heavy-duty doors and gates, providing a robust and reliable connection that can handle the weight and frequent use without failing.
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