How are the performance grades of fastener bolts expressed?

The mechanical properties of fastener bolts are divided into different grades. The following is a brief introduction to carbon steel and stainless steel as an example.

Carbon steel: Metric bolts mechanical property grades can be divided into:3.6,4.6,4.8,5.6,5.8,6.8,8.8,9.8,10.9,12.9common10performance level. Stainless steel is divided into60,70,80(Austenite);50,70,80,110(martensite);45,60(Ferrite) three types.