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Many users can not tell the difference between high strength nuts and ordinary nuts. In fact, it is very easy to distinguish them simply by knowing their standards and other characteristics. The so-called high-strength nuts are special bolts with high strength and high fatigue resistance used in special equipment or projects. Of course, the general high-strength nuts are used with high-strength bolts to achieve better results.

Many users can not tell the difference between high strength nuts and ordinary nuts. In fact, it is very easy to distinguish them simply by knowing their standards and other characteristics. The so-called high-strength nuts are special bolts with high strength and high fatigue resistance used in special equipment or projects. Of course, the general high-strength nuts are used with high-strength bolts to achieve better results.

We generally see many bolts with m heads in the market are general nuts, rather than high-strength nuts. Generally, the calibration surface of hexagonal nut is M30,M30 indicates the thread standard, I .e. the thread inner diameter is 30mm, grade 10 indicates the application function grade of bolt, and TZN is the appearance treatment method.

Other types of bolts have their own expressions, but generally threaded bolts should use "m" as the initial bolt function level:

The functional grades of nuts are divided into 3, 4, 4, 5, 5.8, 6, 8, 10 and 12. This notation refers to 10 as an example, 10 represents 1/100 of the tensile strength of bolts, that is to say, the tensile strength of bolts of this brand must reach 1000MPa, which may be higher than 1000MPa in practice.

According to GB/t3098.1, the smaller tensile strength of this grade bolt must be greater than 1040mpa. The yield ratio expressed after the decimal point, that is, the (yield strength/tensile strength) of the bolt = 0.9, that is, the yield strength = 1000*0.9=900MPa. The yield strength of this grade bolt must be higher than 900mpa to be qualified.

Generally, we call nuts 8.8, 10.9 and 12.9 high-strength nuts.

It should be noted that GB/t3098.1 does not give detailed values of the bending strength of the three brands of bolts. This is because for high strength bolts, 0.8 and 0.9 are smaller bending strength ratios that are adjusted by grade. Since high-strength bolts are used in very important links and there is no spot sale in the market, they need to be ordered from the bolt manufacturer. Therefore, the detailed yield is usually produced by the buyer's detailed value.