Many users do not know what is the difference between high strength nuts and general nuts, in fact, only need to understand their specifications and other characteristics is very simple to distinguish. The so-called high strength nut is used in special equipment or engineering side with high strength, high fatigue resistance of the special bolt.

   Of course, general high-strength nuts are matched with high-strength bolts to achieve better use. We generally see many bolts with M head in the market are general nuts, rather than high strength nuts general hexagonal nut demarcating side for the following format M30 during which M30 indicates the thread specification, that is, the inner diameter of the thread is 30mm, grade 10 indicates the use of the function of the bolt grade, tZn for surface treatment.

   Other ways of bolt also has its own expression method, but the general thread are to “M” to start the bolt function grade: nut function grade from small to large is divided into 3, 4, 4, 5, 5.8, 6, 8, 10, 12 so many grades. This symbol method means taking 10 as an example, 10 indicates 1/100 of the tensile strength of the bolt, which means that the tensile strength of the bolt of this grade is necessary to reach the level of 1000MPa, and may be higher than 1000MPa in practice.

   The smaller tensile strength of the grade bolt is necessary to be greater than 1040MPa. After the decimal point indicates the flexural ratio, which is the bolt (yield strength/tensile strength) =0.9 that is, the yield strength =1000*0.9=900MPa, the yield strength of the grade bolt is necessary to be higher than 900MPa to be qualified.