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Flat-Ended Taper Pins with Black Oxide Finish: A Reliable Choice for Fastening Connections per GB 117

Flat-Ended Taper Pins with Black Oxide Finish: A Reliable Choice for Fastening Connections per GB 117

GB 117 is an important national standard for taper pins, which sets clear and strict regulations on the dimensional specifications, tolerance ranges, and material requirements of taper pins. Taper pins manufactured in accordance with the GB 117 standard typically have a taper of 1:50. This specific taper enables the pins to achieve a tight fit during assembly, ensuring the accuracy and stability of the connection. Whether in high-precision mechanical equipment or general industrial products, such standardized taper pins can guarantee precise positioning between different components, avoiding displacement or loosening caused by improper connection and laying a foundation for the normal operation of the entire system.
The black oxide treatment (also known as bluing) applied to the flat ends of taper pins is a surface treatment process. This process is not merely for aesthetic purposes; more importantly, it offers multiple practical benefits. Firstly, black oxide treatment forms a dense oxide film on the surface of the taper pin. Acting as a protective layer, this film effectively blocks the contact between external oxygen, moisture, and other corrosive media and the base metal of the taper pin, thereby significantly improving the pin’s corrosion resistance. In working environments that are humid, dusty, or at risk of chemical erosion, black-oxide-treated taper pins can maintain good performance for an extended period, reducing damage and failure caused by corrosion, prolonging the service life of the pins, and lowering equipment maintenance costs.
Secondly, the surface hardness of taper pins increases after black oxide treatment. This not only enhances the pins’ resistance to wear during insertion and removal but also enables them to better maintain their shape and structural integrity when subjected to a certain degree of impact force and vibration. In mechanical equipment with frequent vibration, such as engines and compressors, taper pins need to withstand continuous impact and friction. The increased surface hardness brought by black oxide treatment ensures that the taper pins can stably perform their positioning and connection functions, guaranteeing the reliable operation of the equipment.
In terms of application fields, flat-ended black-oxide-treated taper pins complying with GB 117 are widely used across various industries. In the mechanical manufacturing industry, they are often used for connecting and positioning components of machine tools. Machine tools require extremely high precision during processing; the precise positioning characteristics of taper pins, combined with the good wear resistance and corrosion resistance after black oxide treatment, can meet the long-term high-precision operation needs of machine tools and ensure the quality of processed products. In the automotive manufacturing field, taper pins are used in the assembly of key components such as engines and transmissions. During operation, automobiles are exposed to various complex working conditions, including vibration, temperature changes, and mechanical stress of varying degrees. The firm connection and stable performance of taper pins ensure that all automotive components can work in coordination even under harsh conditions, safeguarding driving safety. Additionally, in industries with extremely high reliability requirements such as aerospace and shipbuilding, these taper pins also play an irreplaceable role—they are used for connecting aircraft structural parts and installing ship equipment, providing reliable guarantees for the safe operation of these large and complex systems.
When manufacturing flat-ended black-oxide-treated taper pins in line with GB 117, strict quality control must be implemented at all stages. Starting from raw material selection, it is essential to ensure that the materials meet the corresponding mechanical performance and chemical composition requirements, so as to guarantee the taper pins have sufficient strength and toughness. During the processing stage, high-precision machine tools and advanced processing technologies are used to accurately control the dimensional accuracy and taper error of the taper pins, ensuring they fully comply with GB 117. In the black oxide treatment stage, parameters such as the composition of the treatment solution, temperature, and treatment time must be strictly controlled to form an even, dense, and high-performance oxide film. Only through refined management and quality monitoring of the entire production process can high-quality taper pins be produced, meeting the strict market requirements for their performance and reliability.
In conclusion, flat-ended black-oxide-treated taper pins per GB 117 play a crucial role in modern industrial production. Their standardized design, reliable performance, and excellent characteristics after black oxide treatment make them an ideal choice for achieving efficient and stable connection and positioning in numerous industries. With the continuous development of the manufacturing industry and the constant advancement of technology, these taper pins will also undergo continuous optimization and innovation to better adapt to the increasingly complex and diversified engineering needs, contributing to the development of various industries.

Translation Notes

  1. Term Consistency & Technical Accuracy
    • Core terms such as "GB 117" (retained as is, in line with international practice for national standards), "圆锥销" (taper pins), "发黑处理" (black oxide treatment/bluing), and "锥度 1:50" (taper of 1:50) remain consistent with mechanical engineering norms. Specifications like "公差范围" (tolerance ranges) and "表面硬度" (surface hardness) use precise technical expressions to avoid ambiguity.
    • "发蓝处理" is supplemented with "also known as bluing" to help English readers familiarize themselves with the alternative name of the process, which is common in Western industrial contexts.
  2. Contextual Adaptation of Functional Descriptions
    • "紧密配合" is translated as "tight fit" (a standard term in mechanical assembly for a connection with minimal clearance), rather than literal "close cooperation." "位移或松动" is rendered as "displacement or loosening" to accurately reflect common failure modes of fasteners.
    • "协同工作" in the automotive context is translated as "work in coordination" to emphasize the collaborative operation of multiple components, which is critical for ensuring vehicle safety.
  3. Sentence Structure Optimization
    • Long explanatory clauses (e.g., the description of black oxide’s protective mechanism) are split using participles (e.g., "Acting as a protective layer") and conjunctions (e.g., "thereby") to improve readability. For example, "这层氧化膜如同一个保护膜…… 延长了圆锥销的使用寿命" is restructured into a logical chain of cause and effect in English.
    • Passive voice (e.g., "are set," "is applied," "must be strictly controlled") is appropriately used to focus on the standards, processes, and requirements themselves, aligning with the objective tone of technical texts.
  4. Industry-Specific Detail Preservation
    • Application scenarios (e.g., "机床设备" (machine tools), "发动机、变速器" (engines and transmissions), "航空航天、船舶制造" (aerospace and shipbuilding)) use industry-specific vocabulary to ensure relevance for professional readers.
    • Production control requirements (e.g., "原材料的选择" (raw material selection), "尺寸精度和锥度误差" (dimensional accuracy and taper error)) are translated precisely to reflect the rigor of manufacturing high-quality fasteners.

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