Screw size parameter description

The size parameters of screws include diameter, length, pitch, etc. These parameters jointly determine the specifications and uses of screws.

Diameter: The diameter of a screw refers to the distance from the center of the thread to the axis of symmetry, and the common unit is millimeter (mm). The size of the diameter directly affects the load and torque capacity of the screw. For example, the diameter of an M3 screw is 3mm, which is suitable for small devices such as electronic products and instruments; the diameter of an M4 screw is 4mm, which is suitable for home appliances, mechanical equipment and other fields; the diameter of an M5 screw is 5mm, which is suitable for mechanical equipment, automobiles, motorcycles and other fields; the diameter of an M6 screw is 6mm, which is suitable for engineering machinery, automobiles, building structures and other fields; the diameter of an M8 screw is 8mm, which is suitable for large mechanical equipment, building structures and other fields.

Length: The length of a screw refers to the distance from the screw head to the screw tail, which is also in millimeters (mm). The choice of screw length is usually based on actual needs. If the length is too short, it will not be enough, and if the length is too long, it will increase the cost and affect the appearance. Common screw lengths are 10mm, 20mm, 30mm, etc.

Pitch: The pitch refers to the distance between each turn of the thread, and the common unit is millimeter (mm). The size of the pitch affects the torque and tightening effect of the screw. For example, fine-thread screws are used in situations that require fine adjustment or high loads, while coarse-thread screws are suitable for general tightening needs.

In addition, there are other parameters for screws such as thread type, head groove shape, head shape, material and surface treatment, etc. The selection of these parameters depends on the specific application scenario and design requirements. For example, stainless steel expansion screws are selected in different specifications according to the actual situation of the wall for fixing and hanging objects.

In summary, choosing the right screw size parameters is crucial to ensure the correct use and performance of fasteners.