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Do you know what are the commonly used screw standards?

2020-08-10

    At present, the most commonly used standards in our usual business are as follows:
    GB—China National Standard (National Standard)
    ANSI—American National Standard (American Standard)
    DIN—German National Standard (German Standard)
    ASME—American Society of Mechanical Engineers Standard
    JIS—Japanese National Standard (Japanese Standard)
    BSW—British National Standard
    GB—National Standard is one of our country's many standards, in addition to industry standards, professional standards and departmental standards. National standards are divided into GB (mandatory standards), GB/T (recommended standards) and GBn (national internal standards). What we usually see like GB30, GB5783, etc. are mandatory standards.
    In addition to the differences in the basic dimensions of the above standards, such as the opposite sides of the head and the thickness of the head, the most important thing is the difference in the threaded part. The threads of GB, DIN, JIS, etc. are all based on MM (millimeters), collectively called metric threads. In addition, threads such as ANSI and ASME are called American standard threads in inches. In addition to the metric thread and the American thread, there is also a BSW-imperial standard, the thread is also in inches, commonly known as Wyeth thread.
Metric thread is based on MM (millimeter), and its cusp angle is 60 degrees. Both American and British threads are measured in inches. The cusp angle of American threads is also 60 degrees, while the cusp angle of British threads is 55 degrees. Due to the different measurement units, the representation methods of various threads are different. For example, M16-2X60 represents a metric thread. His specific meaning means that the nominal diameter of the screw is 16MM, the pitch is 2MM, and the length is 60MM. Another example: 1/4-20X3/4 means inch threads. His specific meaning is the nominal diameter of the screw. It is 1/4 inch (one inch = 25.4MM), there are 20 teeth on one inch, and the length is 3/4 inch. In addition, to indicate American screws, UNC and UNF are usually added after the British screws to distinguish between American coarse threads and American fine threads.
In the usual domestic sales business, the most frequently encountered standards are GB (National Standard) and DIN (German Standard).

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