Pitch: the measurement between the apex of adjacent threads on the bolt’s shank, equal to the ratio of threads to unit length. So an M8 bolt would have a diameter that’s slightly under 8mm.Ģ.
The defined diameter of metric bolts is actually slightly larger than the actual diameter. Diameter: the width of the bolt shank, the bolt head is not included. The bolt dimension can also be expressed in imperial units.ġ. Sometimes, the pitch is omitted in the abbreviated format, such as M8-20, this means the bolt has a coarse thread. For example, in M8-1.0*20, the “M” means the Metric thread designation, the digit 8 refers to the Nominal diameter (in millimeters), 1.0 refers to the pitch, and 20 refers to the length. The size of a metric bolt is specified using pitch, diameter, and length in millimeters. Metric bolts are referenced using “M” sizes, such as the M8 bolt size.
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