Many customers are confused about the difference between high-strength nuts and ordinary nuts, as long as we master their specifications, models and other characteristics, it is easy to distinguish them. Today, our company will give you some popular science: the so-called high-strength nuts are special bolts with high toughness and high fatigue resistance that are commonly used in special equipment and engineering. Of course, generally high-strength nuts are used with high-strength bolts to achieve a better experience. We generally see that many bolts with M mountain characters on the market are all ordinary nuts, not high-strength nuts. The calibration of ordinary hexagonal head nuts is the following file format M30, in which M30 marks the thread standard. In fact, the inner diameter of the thread is 30mm, and the application performance level of class 10 marks the bolt, and tZn is the surface treatment method. Other types of bolts also have their own expressions, but generally those with external threads must be expressed as"m"Start bolt performance level: The nut performance level is divided into 3, 4, 4, 5, 5.8, 6, 8, 10, 12 levels from small to large. This type of marking means that taking 10 as an example, 10 marks 1/100 of the tensile strength of the bolt, that is to say, the tensile strength of this level of bolt must reach the level of 1000MPa, and it may actually be higher than 1000MPa. GB/T3098.1 requires the minimum tensile strength of bolts of this level to exceed 1040MPa. The yield strength ratio marked after the decimal point is actually the bolt’s (yield strength/tensile strength)=0.9, that is, the yield strength=1000*0.9=900MPa. The yield strength of bolts of this level needs to be higher than 900MPa to be regarded as meeting the standard. Generally, we call nuts of 8.8, 10.9, and 12.9 grades high-strength nuts. It should be noted that GB/T3098.1 does not give specific values of yield strength for these three grades of bolts, mainly because 0.8 and 0.9 are the small yield strength ratios specified in this grade for high-tenacity bolts, because high-tenacity bolts are used for critical connections, and there are no spot transactions on the market at present, and they must be booked with the bolt manufacturer. Therefore, the specific yield ratio is usually manufactured by the buyer specifying the specific value.