Stainless steel nuts we are also called stainless steel nuts, mainly used with 304 stainless steel bolts or screws screwed together to play a reinforcing role in the fastener parts, there are many types of material nuts, the most common commonly used or stainless steel material, because of its strong corrosion resistance, today and we talk about stainless steel nuts are divided into which grades:

Grades of stainless steel nuts
The performance grade of stainless steel nuts is divided into 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, 12.9 and more than 10 grades, of which 8.8 grade and above nuts material for low carbon alloy steel or medium carbon steel and heat treatment (quenching, tempering), commonly known as high strength nuts, the rest is commonly known as ordinary stainless steel nuts. Nut performance grade markings have two parts of the number, respectively, the nominal tensile strength value of the nut material and flexural strength ratio value.

The meaning of stainless steel nut performance grade
The above gives you a general description of the grade classification of stainless steel nuts, the following gives you an example for easy understanding, for example. Performance grade 4.6 level of nuts, the meaning is
First, stainless steel nut material nominal tensile strength of 400MPa grade;
Second, the nut material yield to strength ratio of 0.6;
Third, the nominal yield strength of the nut material up to 400 × 0.6=240MPa grade.
Through the above explanation, I believe that we have on how to choose suitable for their own project stainless steel nuts have a rough range, but remember that nuts are used with bolts, so whether in stainless steel nuts or bolts on the choice of your friends must pay extra attention to ah.