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In the usual domestic sales business, the standards we most often encounter are GB (national standard) and DIN (German standard).
In terms of non-aromatic products, the following standards are mainly encountered: GB30; GB5783; GB5782; GB52; GB6170; GB818; GB819; GB845; GB846; GB70; DIN912; DIN933; DIN931. At present, GB30 (old national standard) has been replaced by GB5783 (new national standard) in the standard book. GB52 (old national standard) has been replaced by GB6170 (new national standard) in the standard book.
In 1986, our country set new standards for standard parts, which are commonly referred to as new standards in the business. The most used ones are GB5780, GB5781, GB5782, GB5783, and GB5784. GB5780 is a hexagonal thick rod half-screw, its accuracy grade is C-class product, can be replaced by GB5782 (GB5782 is a hex head thick rod full-tooth screw, its accuracy is grade A and B.) GB5781 is a Hexagonal Head Screws with a precision rating of Class C. Can be replaced by GB5783 (GB5783 is a hexagonal full-screw screw with an accuracy class of A and B). GB5784 is a hexagonal screw with a thin rod and a half tooth.
The difference between the new standard and the old standard is that the products of the M8, M10, M12, M14, and M22 series differ in the width of the opposite side. In addition to the new products of the M22 series, the head-to-edge of the new standard products M8, M10, M12, and M14 is 1 mm smaller than the opposite side of the old standard. They are 13, 16, 18, 21MM, and the new products of the M22 series, the new standard is larger than the old standard but should be 2MM. For the thickness of the head, there is a slight difference between the new standard and the old standard, and it can be used when the requirements are not very strict.
The difference between the new standard and the German standard is that the product specifications of the M10, M12, M14, and M22 differ in the width of the opposite side. The head-to-edge new standard of M10, M12, and M14 are 1mm smaller than the German standard. For the new product of the M22, the head-to-edge width is 2MM larger than the width of the opposite side of the German standard, and the others can be used universally.
For hex nuts, the commonly used standards are GB52, GB6170, GB6172, and DIN934. The main difference between them is: GB6170 is thicker than GB52, GB6172, and DIN934, commonly known as thick nuts. The other is the difference on the side, the opposite side of DIN934, GB6170, GB6172 in the M8 nut series is 13MM smaller than the opposite side of GB52 14MM, M10 nut, the opposite side of DIN934 and GB52 is 17MM, The opposite side of GB6170 and GB6172 should be 1MM, the nut of M12, the opposite side of DIN934 and GB52 is 19MM larger than the opposite side of GB6170 and GB6172 18MM. For the M14 nut, the opposite side of DIN934 and GB52 is 22MM larger than the opposite side 21MM of GB6170 and GB6172. In addition, the nut of M22, the opposite side of DIN934 and GB52 is 32MM, which is 2MM smaller than the opposite side of GB6170 and GB6172. (GB6170 and GB6172 have the same width except for their different thicknesses.) The remaining specifications can be used without considering the thickness.