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Fastener strength
2025-12-11
Fasteners can be divided into bolt-type products with raised threads and nut-type products with recessed threads. According to the shape of the rotating part at the head of the fastener, there are cross-slot heads, single-slot heads, hexagonal heads, etc. In addition, for different usage environments and purposes, fasteners also have additional characteristics, so the classification of fasteners is quite complex.
Regarding the representation method of the strength of screws and bolts, the first digit is 1/100 of the nominal tensile strength in MPa, and the second digit is 10 times the ratio of the nominal yield point to the nominal strength. For example, "10.9" indicates a bolt with a nominal tensile strength of 1000 MPa and a 0.2% yield strength of 900 MPa.
The strength of the nut is indicated by the strength level number of the highest strength bolt used in combination with it. The strength of stainless steel fasteners is expressed by the combination of the steel type and the tensile strength level number, for example, "A2-50".
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