Many users do not know the difference between high-strength nuts and ordinary nuts. In fact, they can be easily distinguished by understanding their specifications and other characteristics. The so-called high-strength nut is a special Bolt Nut and Washer with high strength and high fatigue resistance used in special equipment or engineering. Of course, generally high-strength nuts are used with high-strength Bolt Nut and Washer to achieve better results.
We generally see in the market that many Bolt Nut and Washers with M heads are ordinary nuts, not high-strength nuts. The calibration side of the normal hexagonal head nut is the following format M30, where M30 indicates the thread specification, which is the inner diameter of the thread It is 30mm, grade 10 indicates the performance grade of Bolt Nut and Washer, and tZn is the surface treatment method. Other forms of Bolt Nut and Washer also have their own expressions, but generally threaded ones start with "M". Bolt Nut and Washer performance level: the performance level of the nut is divided into 3, 4, 4, There are so many levels of 5, 5.8, 6, 8, 10, and 12. This marking method means taking 10 as an example 10 to indicate 1/100 of the tensile strength of the Bolt Nut and Washer, which means that the tensile strength of this grade of Bolt Nut and Washer must reach the level of 1000 MPa, which may actually be higher than 1000 MPa. GB/T3098.1 stipulates that the smaller tensile strength of this grade of Bolt Nut and Washer must be greater than 1040MPa. The indicated yield strength ratio after the decimal point is Bolt Nut and Washer's (yield strength/tensile strength)=0.9, that is, the yield strength=1000*0.9=900MPa. The yield strength of this grade of Bolt Nut and Washer must be higher than 900MPa. Qualified.
Usually we call 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 specific values of yield strength for these three grades of Bolt Nut and Washer. This is because 0.8 and 0.9 are both of this grade for the high-strength Bolt Nut and Washer. The specified smaller yield ratio, because high-strength Bolt Nut and Washer are used for very important links, there is no spot on the market and must be ordered with the Bolt Nut and Washer manufacturer. Therefore, the specific yield ratio is generally determined by the manufacturer. The purchaser proposes specific values to produce.
