GuideBolt Grades 8.8 and 10.9: What the Numbers Mean
The two numbers in a bolt grade are not a product code. They encode the tensile strength and the yield ratio, and between 8.8 and 10.9 they change the shear factor, the preload, and whether the bolt can be used in a slip-resistant connection at all. Here is what each one does in an EN 1993-1-8 check.
Minh Tran · 23 Oct
