Qingdao Terada Hardware Co.,Ltd
Its cusp angle is 60 degrees. Both American and British threads are in inches. The cusp angle of the U.S. thread is also 60 degrees, while the cusp angle of the Imperial thread is 55 degrees. Due to the different units of measurement, the representation of various threads is not the same. For example, the M16-2X60 represents a metric thread. His specific meaning is to indicate 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 the inch thread, and his specific meaning is the nominal diameter of the screw. 1/4 inch (one inch = 25.4 MM), 20 teeth on one inch and 3/4 inch length. In addition, to express American screws, UNC and UNF are usually added after the English screws, so as to distinguish between American coarse teeth and American fine teeth.
In the domestic sales business, the most commonly encountered standards are GB (GB) and DIN (Germany).
In terms of non-aromatic products, the following standards will be mainly touched: GB30; GB5783; GB5782; GB52; GB6170; GB818; GB819; GB845; GB846; GB70; DIN912; DIN933; GB30 (old national standard) has been replaced by GB5783 (new national standard) in the standard book. GB52 (old national standard) has been replaced by GB6170 (new national standard) in the standard book.
In the internal hexagon, there are two versions of the national standard, one for the GB70-76, 76 years version, one for the GB70-8585 version, our company is implementing the DIN912 standard, so in the actual business operation should pay attention to the difference: where GB70 -85 completely coincides with DIN 912, so there is no difference in the use of the new standard, mainly between GB70-76 and DIN912: M8 series of hexagonal products, GB70-76 round head diameter of 12.5MM, It is smaller than DIN912 13.27MM, M10 series of hexagonal products, GB70-76 round head diameter of 15MM, smaller than DIN912 16.27, M12 series of hexagonal, GB70-76 round head diameter of 18MM, Compared with DIN912 on the opposite side of 18.27 to be smaller, and the other like the M16, M20 series of hexagonal GB70-76 round head diameter than the DIN912 smaller than the 0.33MM, respectively 24MM, 30MM. DIN912 is 24.33MM and 30.33MM respectively. In addition, the inner-to-edge width between the old mark and the German standard hexagon is different due to different standards, and the inner edge of GB70-76 should be smaller, and should also be noted in the business operation.
In addition, the carriage screws that may be used at ordinary times also have some differences. Here is an explanation. In the national standard, there are two standards for carriage screws, namely GB12 (small semi-circular head square neck screws) and GB14 (large semi-circular head side (Neck screws), usually in the market more commonly used in Germany standard DIN603. These three are now distinguished: For the round neck, in the same specification comparison: GB12 <GB14 <DIN603 <SPAN>. Usually, when the carriage screw is used, the head and neck are often required to be large and thick, so the standard of the DIN603 carriage screw fully meets the requirements.
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