







The cylindrical pin stands as a quintessential mechanical connector, and here is an in-depth exploration of its attributes:
1, Fundamental Definition and Purpose
A cylindrical pin is a classic elongated component, meticulously crafted from metal or plastic, bearing a cylindrical form. It serves the pivotal role of fitting seamlessly between two or more connecting parts, achieving strong connection, precise positioning, and efficient power transmission. This pin typically employs a slight interference fit to secure itself within a hole, facilitating the fastening of parts, transmission of power, or acting as a vital positioning element.
2, Principal Types and Distinctive Features
Cylindrical pins manifest in various forms, each tailored for specific application scenarios, complete with unique attributes:
1. Standard Cylindrical Pin:
• Features: Boasting a straightforward design, superb alignment, and exceptional load-bearing strength.
Application: Ideal for environments with stringent alignment demands, such as in machine tools, the automotive industry, and power tools.
2. Internal Thread Cylindrical Pin:
• Features: Equipped with internal threading for easy disassembly and assembly, albeit with moderate positioning precision. Its design simplifies removal and installation.
Application: Perfect for locations where frequent assembly and disassembly are necessary.
3. Elastic Cylindrical Pin:
• Features: Flexible and hollow, with side slots for simple assembly. Capable of multiple disassemblies without affecting the inner hole, suited for challenging disassembly scenarios.
Application: Ideal for situations demanding recurrent disassembly paired with modest positioning precision.
4. Perforated Pins:
• Features: Perforations along the pin allow for locking with an open mouth pin, ensuring straightforward disassembly.
Application: Perfectly suited for applications like hinges that necessitate regular disconnection and reconnection.
3, Composition Materials and Standards
Cylindrical pins are crafted from a variety of materials including stainless steel (SUS304, 316, etc.), carbon steel (C35, C45, etc.), and bearing steel (Gcr15, etc.). Each material offers distinct mechanical and corrosion resistance characteristics, allowing selection tailored to specific environmental and usage requisites.
Additionally, cylindrical pins adhere to national or international standards such as GB119 (standard cylindrical pins) and GB120 (internally threaded cylindrical pins). These standards delineate technical specifications for dimensions, tolerances, and materials, ensuring superior quality and interchangeability.
4, Installation Guidelines and Usage Considerations
1. Pre-Installation Preparation:
Ensure the pin hole is precisely reamed to align with the size, shape, and surface smoothness criteria demanded by the cylindrical pin.
A thin layer of lubricating oil should be applied to the cylindrical pin to ease installation by minimizing friction and wear.
2. Installation Techniques:
Position a copper rod against the pin's end face and gently guide the cylindrical pin into the designated hole.
Alternatively, employ specialized tools (such as a C-clip) to press the cylindrical pin into its intended position.
3. Usage Precautions:
Given the relatively high disassembly force required for cylindrical pins, they can scratch mating surfaces and are generally considered non-removable connections. For scenarios demanding regular disassembly, elastic cylindrical pins or alternative types designed for multiple removals should be chosen.