Crosses screws M10 M20 Carbon steel Flat & CSK Head Machine Metal Screw Grade8.8 Metal bolts

A machine screw is a fastener that is used like any other fastener to join two or more objects. However, machine screws are unique because of their size. The American Society of Mechanical Engineers (ASME) defines machine screws as having a diameter of no more than 0.75 inches. They can be less than 0.75 inches in diameter, but no larger. As a result, machine screws are generally smaller than most other types of screws.

In addition to being 0.75 inches or less in diameter, machine screws also feature a uniform thread. What exactly does this mean? Well, screws typically have uniform or tapered threads. Uniform threads mean that the external threads (the spiral ridges on the outside of the screw) remain the same size from the top to the bottom of the screw. In contrast, tapered threads mean that the threads of the screw expand in taper or towards the bottom. Machine screws have a uniform thread that remains the same size from top to bottom.

High-strength screws play a vital role in fastening products, and the choice of head type directly affects the stability and aesthetics of the assembly. Common head types include pan head, flat head, countersunk head, hexagonal head, large flat head, round head and so on.

Pan head screws, after assembly, the head protrudes from the surface of the jointed object. Suitable for internal workpiece or invisible workpiece fixing, common groove type has cross groove, one groove, metre groove, widely used in internal or hidden assembly.

Flat head screws, the head is exposed, suitable for mobile phones, watches and other precision parts of the connection, the head and the bolt connection part of the 90-degree angle, and the head is very thin, to facilitate precision assembly.

Countersunk head screws,  the head is funnel-shaped, after the fastening is completed and the object to be fastened flush, suitable for external workpiece surface fixing, so that the surface of the workpiece is beautiful and flat, commonly used in thin plate fixing.

Machine screws are often preferred over other, larger screws. Due to their small size, they offer a wider range of applications. Machine screws can be used to attach countless types of products, objects, and surfaces.

Machine screws are also available in different materials. Stainless steel is a common material used to manufacture machine screws. It is strong and durable and provides a high level of protection against rust and corrosion. Aluminium is another common material used to manufacture machine screws. Like stainless steel, it offers protection against rust and corrosion. Aluminium machine screws are not as strong as stainless steel screws, but they are also not as heavy. For applications where weight is a concern, aluminium machine screws may be preferred!

Carbon steel is a common metal material with a range of advantages and disadvantages:

• High Strength: Carbon steel has excellent strength properties and is capable of withstanding large external forces and pressures.
• Good Wear Resistance: Carbon steel has high wear resistance and is able to resist abrasion and scratches.
• Plasticity: Carbon steel is easy to machine and form, and can be plastically deformed by cold working, hot working, and forging processes.
• Economical Price: Compared with other metal materials, carbon steel production costs are relatively low.

• Corrosion Tendency: Carbon steel is susceptible to oxidation and corrosion when exposed to moisture or acids.
• Low Seismic Resistance: Compared to other high-strength alloy materials, carbon steel has poor seismic resistance.
• High Electrical and Thermal Conductivity: This can cause problems in certain specific applications.
• High Density: The relatively high density of carbon steel makes it heavier than other light alloys.

Stainless steel is a high-quality alloy steel, with corrosion resistance, high temperature resistance, and high strength advantages. Maintenance is important to ensure its long-term performance:

• Physical Maintenance: Avoid impact or scratches on the surface. Use soft cloth for cleaning.
• Chemical Maintenance: In humid environments, use appropriate cleaning agents and rinse thoroughly.