ASTM F568M is an ASTM International standard for metric bolts, screws and studs that are used in general engineering applications.
It is 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.
[1] and has been replaced by ISO 898-1[2] This standard defines property classes, the metric equivalent of a screw grade, that are almost identical to those defined by ISO 898-1,[2] except for the addition of the 8.8.3 and 10.9.3 classes.
[1][3] The standard is referenced by ASME B18.29.2M, which defines insert length selection for helical coil screw thread inserts.