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  • ASTM F568M is an ASTM International standard for metric bolts, screws and studs that are used in general engineering applications. It is officially titled: Standard Specification for Carbon and Alloy Steel Externally Threaded Metric Fasteners. It defines mechanical properties for fasteners that range from M1.6 to 100 in diameter. This standard defines property classes, the metric equivalent of a screw grade, that are almost identical to those defined by ISO 898-1, except for the addition of the 8.8.3 and 10.9.3 standards. These two additional standards are fasteners that have the same mechanical properties as their base property class, but are made from weathering steel. This is a standard set by the standards organization ASTM International, a voluntary standards development organizations that sets technical standards for materials, products, systems, and services. Wikipedia