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How to distinguish high strength nut from common nut?

2020-11-20 09:37:38

Many users can't tell the difference between high-strength nuts and ordinary nuts. In fact, they can be easily distinguished by understanding their standard and other characteristics. The so-called high strength nut is a special bolt with high strength and high fatigue resistance used in special equipment or engineering. Of course, high-strength nuts are generally used with high-strength bolts to achieve better application.

In general, we can see that many bolts with m-head are ordinary nuts, rather than high-strength nuts. The calibration side of general hexagon nuts is M30, in which M30 indicates the thread standard, that is, the inner diameter of thread is 30mm, grade 10 indicates the use function grade of bolts, and TZN is the appearance treatment method.

Bolts in other ways also have their own expression methods, but generally the threaded bolts should be in the functional grade of "m" initial bolt:

The functional grades of nuts can be divided into 3, 4, 4, 5, 5.8, 6, 8, 10 and 12. This symbolic method means to take 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 must reach 1000MPa, which may be higher than 1000MPa in practice.

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

Generally, we call the nuts of 8.8, 10.9 and 12.9 as high strength nuts.

It should be noted that GB / t3098.1 does not give the detailed values of yield strength for the three grades of bolts. This is because for high strength bolts, 0.8 and 0.9 are the smaller yield ratio regulated by the grade. Because high strength bolts are used for very important links, there is no spot sale on the market, so it is necessary to order with the bolt manufacturer, so the detailed yield ratio is generally It is produced by the buyer with detailed values.



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Email: JP.NH @163.COM

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