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Explain the standard specifications of screws in the fastener industry in detail
by：Fortuna
2021-04-27
In terms of non-products, the following standards are mainly encountered: GB30; GB5783; GB5782; GB52; GB6170; GB818; GB819; GB845; GB846; GB70; DIN912; DIN933; DIN931, etc. GB52 (old national standard) has been replaced by GB6170 (new national standard) in the standard book. At present, GB30 (old national standard) has been replaced by GB5783 (new national standard) in the standard book.
Metric thread is based on MM (millimeter), and its cusp angle is 60 degrees. In addition, to indicate American screws, UNC and UNF are usually added after the British screws to distinguish between American coarse teeth and American fine teeth. His specific meaning is that the nominal diameter of the screw is 16MM, the pitch is 2MM, and the length is 60MM. Another example: 1/420X3/4 means inch threads, and his specific meaning is that the nominal diameter of the screw is 1 /4 inches (one inchu003d25. For example, M16-2X60 means metric threads. Due to the different measurement units, the representation methods of various threads are different. The cusp angle of American threads is also 60 degrees, The cusp angle of the inch thread is 55 degrees. Both the American thread and the inch thread are measured in inches. 4MM), there are 20 teeth in one inch, and the length is 3/4 inch.
In addition to the differences in the basic dimensions of the above several standards, such as the opposite side of the head and the thickness of the head, the most important thing is the difference in the threaded part. In addition to the metric thread and the American thread, there is also a BSW inch standard, the thread is also in inches, commonly known as the Wyeth thread. 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.
GB national standard is one of many standards in our country, 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 all mandatory standards.
JIS Japanese National Standard (Japanese Standard) BSW British National Standard
DIN German National Standard (German Standard) ASME American Society of Mechanical Engineers Standard.wjw.
GB Chinese National Standard (National Standard) ANSI American National Standard (American Standard)
Standard screws are specifications, and each country and department has its own standards. At present, the most commonly used standards in our daily business are as follows:
In the usual domestic sales business, the most frequently encountered standards are GB (National Standard) and DIN (German Standard).
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. GB5784 is a hexagonal screw with a thin rod and a half tooth. ) GB5781 is a hexagon head full-thread screw with a precision grade of C-level product. 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 hexagonal head thick shank full-thread screw, and its accuracy is grade A and B. It can be replaced by GB5783 (GB5783 It is a hexagon head full-thread screw, and its accuracy grade is A and B).
Metric thread is based on MM (millimeter), and its cusp angle is 60 degrees. In addition, to indicate American screws, UNC and UNF are usually added after the British screws to distinguish between American coarse teeth and American fine teeth. His specific meaning is that the nominal diameter of the screw is 16MM, the pitch is 2MM, and the length is 60MM. Another example: 1/420X3/4 means inch threads, and his specific meaning is that the nominal diameter of the screw is 1 /4 inches (one inchu003d25. For example, M16-2X60 means metric threads. Due to the different measurement units, the representation methods of various threads are different. The cusp angle of American threads is also 60 degrees, The cusp angle of the inch thread is 55 degrees. Both the American thread and the inch thread are measured in inches. 4MM), there are 20 teeth in one inch, and the length is 3/4 inch.
In addition to the differences in the basic dimensions of the above several standards, such as the opposite side of the head and the thickness of the head, the most important thing is the difference in the threaded part. In addition to the metric thread and the American thread, there is also a BSW inch standard, the thread is also in inches, commonly known as the Wyeth thread. 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.
GB national standard is one of many standards in our country, 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 all mandatory standards.
JIS Japanese National Standard (Japanese Standard) BSW British National Standard
DIN German National Standard (German Standard) ASME American Society of Mechanical Engineers Standard.wjw.
GB Chinese National Standard (National Standard) ANSI American National Standard (American Standard)
Standard screws are specifications, and each country and department has its own standards. At present, the most commonly used standards in our daily business are as follows:
In the usual domestic sales business, the most frequently encountered standards are GB (National Standard) and DIN (German Standard).
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. GB5784 is a hexagonal screw with a thin rod and a half tooth. ) GB5781 is a hexagon head full-thread screw with a precision grade of C-level product. 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 hexagonal head thick shank full-thread screw, and its accuracy is grade A and B. It can be replaced by GB5783 (GB5783 It is a hexagon head full-thread screw, and its accuracy grade is A and B).
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