Industrial Product Science Popularization

Release Time:

Jun 13,2025

Industrial Product Science Popularization

The specifications and models of bolts are generally represented by the letter "M", followed by a number indicating the nominal diameter of the bolt, in millimeters (mm). Common models include M2.5, M3, M4, M5, M6, M8, M10, M12, M14, M16, M18, M20, etc.

In addition, the specifications of bolts can also include information such as pitch, rotation direction, tolerance zone, etc.

M1.6 bolt: with a diameter of 1.6mm, commonly used for the assembly of electronic devices and precision instruments
M2 bolt: with a diameter of 2mm, also used for the assembly of electronic devices and precision instruments
M2.5 bolt: diameter 2.5mm, widely used in home appliances, daily necessities, office equipment and other fields
M3 bolt: diameter 3mm, suitable for electronic devices, machinery, automobiles, motorcycles and other fields.
M4 bolt: diameter 4mm, widely used in mechanical, automotive, electronic equipment and other fields
M5 bolt: diameter 5mm, suitable for automotive, mechanical, electronic equipment, construction and other fields
M6 bolt: diameter 6mm, suitable for steel structures, bridges, power equipment, ships and other fields
M8 bolt: diameter 8mm, suitable for steel structures, mechanical equipment, wind power equipment and other fields
M10 bolt: with a diameter of 10mm, suitable for steel structures, mechanical equipment, wind power equipment and other fields.