What's stainless steel bolts ?

Stainless steel bolts are bolts made of stainless steel, stainless steel SUS201 bolts, stainless steel SUS304 bolts, stainless steel SUS316 bolts. So what is the use of this bolt compared to ordinary bolts?
        Stainless steel bolts are bolts made of stainless steel, stainless steel SUS201 bolts, stainless steel SUS304 bolts, stainless steel SUS316 bolts, stainless steel SUS316L bolts. The performance grades of stainless steel bolts, studs and studs are divided into 10 grades: from 3.6 to 12.9. The number before the decimal point represents 1/100 of the tensile strength limit of the material, and the ratio of the yield limit of the representative material after the decimal point to the tensile strength limit is 10 times. The performance rating of stainless steel bolts 8.8 means that the material has a tensile strength limit of 800 MPa and a yield limit of 640 MPa. The performance grades of stainless steel bolts, studs and studs are divided into 10 grades: from 3.6 to 12.9. The number before the decimal point represents 1/100 of the tensile strength limit of the material, and the ratio of the yield limit of the representative material after the decimal point to the tensile strength limit is 10 times.
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The performance rating of the nut is divided into 7 levels, from 4 to 12. The figures roughly indicate that the stainless steel nut is guaranteed to withstand 1/100 of the minimum stress.

For uniform inch thread, the external thread has three thread grades: 1A, 2A and 3A, and the internal thread has three grades: 1B, 2B and 3B, all of which are clearance fits. The higher the level number, the tighter the fit.

1, 1A and 1B grade, very loose tolerance class, which is suitable for tolerance fit of internal and external threads. 2, 2A and 2B grades are the most common thread tolerance grades specified by the Inch series of mechanical stainless steel fasteners. 3, 3A and 3B grade, screwed to form the tightest fit, suitable for tight tolerance stainless steel standard parts, for critical design of safety.

Metric thread, external thread has three thread grades: 4h, 6h and 6g, internal thread has three thread grades: 5H, 6H, 7H. The thread fit is preferably combined into H/g, H/h or G/h. For the refined fastener threads such as bolts and stainless steel nuts, the standard is recommended to use 6H/6g.