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PPT Slide

Standards for metric bolts are called a “property class.” A property class designation consists of two numbers separated by a decimal point.

of the nominal tensile strength of the bolt in newtons per

square millimeter.The number after the decimal point is the ratio between the nominal yield stress and the nominal tensile strength, times ten.

must have the property class marked on the head of the bolt.

Property class 6.8 roughly corresponds to SAE grade 2; 8.8 to SAE 5; and 10.9 to SAE 8.