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Hexagon bolts Hexagon nuts Commonly used fastener standards Knowledge
Added:2021-06-28     Views:    

At present, the most commonly used standards in our usual business are as follows:

GB—Chinese 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 many standards in our country. In addition, there are 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. To

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 referred to as 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-Inch standard whose thread is also measured in inches, commonly known as Wyeth thread. To

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 also different. For example, M16-2X60 represents a metric thread. His specific meaning is 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, and 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, if you want to indicate American screws, UNC and UNF are usually added after the British screws to distinguish between the American coarse thread or the American fine thread. To

In the usual domestic sales business, the most frequently encountered standards are GB (National Standard) and DIN (German Standard). To

In terms of production products, the following standards are mainly encountered: GB30; GB5783; GB5782; GB52; GB6170; GB818; GB819; GB845; GB846; GB70; DIN912; DIN933; DIN931, etc. At present, GB30 (old national standard) has been replaced by GB5783 (new national standard) in the standard book. GB52 (old national standard) has been replaced by GB6170 (new national standard) in the standard book. To

In 1986, our country formulated a new standard for standard parts, which is generally called the new standard in business. The most used ones are mainly GB5780, GB5781, GB5782, GB5783, and GB5784. GB5780 is a hexagonal head thick shank half-thread screw, and its accuracy grade is C grade product, which can be replaced by GB5782 (GB5782 is a hex head thick shank full-thread screw, and its accuracy is grade A and B.) GB5781 is a hexagonal head full-thread screw. Thread screws, accuracy grade is C grade product. It can be replaced by GB5783 (GB5783 is a hexagon head full-thread screw, and its accuracy grades are A and B). GB5784 is a hexagonal screw with a thin rod and a half tooth. To

The difference between the new standard and the old standard is that the M8, M10, M12, M14, and M22 series products differ in the width of the opposite sides. Except for the new products of the M22 series, the opposite sides of the heads of the new standard products M8, M10, M12, and M14 are 1MM smaller than the opposite sides of the old standard. They are 13, 16, 18, and 21MM. For the new products of the M22 series, the new standard is 2MM larger than the opposite side of the old standard, so special attention should be paid. For the thickness of the head, there is a slight difference between the new standard and the old standard, and it can be used in general if the requirements are not very strict. To

The difference between the new standard and the German standard is that the product specifications of M10, M12, M14, and M22 differ in the width of the opposite sides. The new heads of M10, M12, and M14 are 1MM smaller than the German standard.


 
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