When it comes to the most commonly used bolt performance grades today, the metric system set by ISO is widely recognized. These grades consist of two numbers separated by a dot, typically found on the bolt head or nut. Popular grades include 8.8, 10.9, and 12.9. To estimate the bolt's tensile strength, multiply the first number by 100. For yield strength, take the second number, multiply it by 10, and use it as a percentage of the tensile strength. For instance, an 8.8 bolt has a tensile strength of approximately 800 MPa and a yield strength of around 640 MPa (80% of 800 MPa).
Stainless steel bolts and nuts often carry markings like A2 or A4. A2 indicates 304 stainless steel, while A4 signifies 316 stainless steel. The following number reflects the tensile strength, which varies depending on the bolt’s specifications. For example, a rating of 70 suggests a tensile strength of 700 MPa for standard stainless steel. Between the two, 316 stainless steel offers superior corrosion resistance compared to 304, making it ideal for environments with stricter demands.
Sometimes, you might notice bolts without any markings. This generally implies that their performance levels are lower, such as grade 4.8 or 5.8, and these are typically unmarked.
At Aozhan Fasteners, we pride ourselves on being a comprehensive service provider specializing in the production, processing, and trading of screws, nuts, and other fastener products. Over the past decade, our focus has been on crafting custom special-shaped bolts and screws, accommodating clients’ drawings and offering OEM/ODM services. Our commitment extends beyond product delivery to providing technical support and after-sales assistance. We aim to serve global dealers, wholesalers, and industrial enterprises, tailoring fasteners and non-standard parts to meet diverse client needs across industries. Our philosophy revolves around “quality survival, technological innovation + service development.†Our greatest reward is earning your trust, becoming your trusted one-stop supplier, and fostering long-term partnerships. Whether you need bolts or other fasteners, Aozhan Fasteners is here to assist you fully. Contact us today to experience our dedication to delivering top-quality products and innovative solutions. Together, let’s build a brighter future!
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