The tensile strength of threaded rods is the determining force per area that a threaded rod, threaded bolt, threaded bar or threaded piece can absorb as the maximum load in relation to its cross-section. This is referred to in strength theory as the permissible stress (tensile strength) in the same way as for screws and nuts. It is given in N/mm².
To differentiate the tensile strength of threaded rods, metric threaded rods and threaded bars made of carbon steel are divided into strength classes (grades) according to their material properties, just like steel screws.
The marking of the strength class of a metric threaded rod consists of two numbers separated by a dot. The left number (4, 5, 8, 10 or 12) corresponds to 1/100 of the nominal tensile strength in N/mm², the right number (6, 8 or 9) indicates ten times the ratio of the lower yield strength to the nominal tensile strength:
Calculation example: class 4.6
The yield strength or elongation is the maximum load that should be taken into account when calculating a construction statics!