Many users can't tell the difference between high-strength nuts and ordinary nuts, so let's follow the rivet nut manufacturers to see. In fact, as long as they understand their specifications and other characteristics, they can easily distinguish them. 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, generally high-strength nuts are used with high-strength bolts to achieve better use.

We generally see that many bolts with M head in the market are ordinary nuts, not high-strength nuts. , Grade 10 indicates the functional grade of the bolt, and tZn is the surface treatment method.

Other forms of bolts also have their own expressions, but generally, those with threads must be based on the functional level of the "M" Z initial bolt: the functional level of the nut is divided into 3, 4, 4, 5, 5.8, 6, 8, 10, 12 so many levels. This symbol method means that 10 is used as an example to indicate 1/100 of the tensile strength of the bolt, which means that the tensile strength of the bolt of this grade must reach the level of 1000MPa, which may be higher than 1000MPa in practice. GB/T3098.1 stipulates that the minimum tensile strength of this grade of bolts must be greater than 1040MPa. The yield ratio after the decimal point is indicated, that is, the bolt's (yield strength/tensile strength) = 0.9, that is, the yield strength = 1000*0.9 = 900MPa. The yield strength of the bolts of this grade must be higher than 900MPa to be considered qualified.

Generally, we refer to the nuts of the three grades of 8.8, 10.9, and 12.9 as high-strength nuts.
It should be noted that GB/T3098.1 does not give detailed values ​​of yield strength for these three grades of bolts.