![]() ![]() Metric bolts with a coarse thread pitch have more threads per inch than comparable imperial bolts.ģ. Metric bolts are available with either coarse or fine thread pitches. 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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