Qingdao Terada Hardware Co.,Ltd
In 1986, China 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 hex-headed coarse-shaft half-screw screw whose accuracy grade is Grade C. GB5782 can be used instead (GB5782 is a hex head coarse-toothed full-screw screw whose accuracy is grade A and B.) GB5781 is a hexagon head Screws, accuracy class C grade. GB5783 can be used instead (GB5783 is a hexagonal head full-screw screw with accuracy class A and B). GB5784 is a semi-hexagonal screw with a thin rod.
The difference between the new standard and the old one is that the products of the M8, M10, M12, M14, and M22 series are different 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. 13, 16, 18, 21MM, respectively, and the M22 series of new products, the new standard than the old standard on the opposite side to 2MM, should pay special attention. 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 mark of M10, M12, and M14 is 1 mm smaller than the German mark. For the M22's new products, the head-to-edge width is 2mm larger than that of the German standard. Others can be used universally.
For hex nuts, the commonly used standards are: GB52, GB6170, GB6172 and DIN934. The main differences between them are: GB6170 thickness is thicker than GB52, GB6172 and DIN934, commonly known as thick nuts. The other is the edge of the difference, M8's nut series DIN934, GB6170, GB6172 on the opposite side is 13MM than the GB52 on the opposite side 14MM to be smaller 1MM, M10 nut, DIN934 and GB52 on the opposite side of 17MM, than GB6170 and GB6172 on the opposite side of the larger 1MM, M12 nut, DIN934, GB52 on the opposite side of the 19MM than the GB6170 and GB6172 on the opposite side 18MM to 1MM. For the M14 nuts, the opposite side of DIN934 and GB52 is 22MM larger than that of GB6170 and GB6172. The other is the M22 nut, DIN934, GB52 on the opposite side of the 32MM, than the GB6170, GB6172 on the opposite side of the 34MM to 2MM. (Except for the thickness of GB6170 and GB6172, the width of the opposite side is exactly the same.) The remaining specifications can be used without considering the thickness.
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