The specification model of the bolt is usually expressed by M, and the number behind M indicates the diameter of the bolt, in mm.
For example, M8 indicates a bolt with a diameter of 8mm, and M10 indicates a bolt with a diameter of 1.0mm. The length of the bolt is generally expressed in L, and the unit is mm.
For example, L50 indicates a bolt whose length is 50mm. The type of bolt can also be expressed in the form of “M circular diameter length (CM)”.
Where M represents the metric thread, for example, M81.25.50 means that the nominal diameter is 8mm. The pitch is 1.25. The screw length is 50mm bolt.
