UNF 7/16'' 1/2'' 9/16'' Carbon steel Galvanized square washer Customized Zinc Plating washer

UNF 7/16'' 1/2'' 9/16'' Carbon steel Galvanized square washer Customized Zinc Plating washer

Square shaped shims and round shims are two common fasteners, mainly used for connecting the gap and stress distribution between bolts, nuts and connecting parts to reduce friction, limit deformation, transfer pressure and prevent air and liquid leakage. Their main differences are as follows:

• Shape: Square shims are in quadrilateral shape with equal side lengths and 90-degree angles; round shims are round with uniform circumferential edges.
• Application scenarios: Square shims are suitable for certain square or regular structural connections and bolt holes due to their shape characteristics, mainly used for track connections such as angles, I-beams and rails, etc.; and round shims are suitable for a wide range of scenarios and are more commonly used than square shims.
• Material: Both can use a variety of metal and non-metallic materials, such as: steel, copper, aluminium, rubber, silicone, etc., just for different working conditions have to choose different materials.
• Installation effect: Due to the round gasket edges for the continuous circumference, by the distribution of stress is more uniform; square gaskets corners of the place of the relative concentration of the force, which may lead to local overloading of the corners of the parts.
• Torque control during installation: In general, it is easier to control the torque during installation of round shims because of their uniform pressure distribution; however, square shims may require stricter torque control during installation to avoid overloading at the corners.
• Possibility of stress concentration: Square shims have four corners, while the edges of round shims are circumferential, so that when subjected to stress, square shims may be subjected to stresses more uniformly than round shims of the same material.

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

• High strength: Carbon steel has excellent strength characteristics and can withstand large external forces and pressures. This makes carbon steel widely used in many engineering fields, such as construction, automotive manufacturing, and aerospace.
• Good wear resistance: Carbon steel has high wear resistance and can resist wear and scratches. This makes carbon steel ideal for manufacturing tools, machine parts and industrial equipment.
• Strong plasticity: Carbon steel is easy to process and form, and can be plastic deformed through cold working, hot working and forging processes. This plasticity makes carbon steel suitable for the manufacture of a wide variety of complex shapes and structures.
• Price economy: Compared with other metal materials, the production cost of carbon steel is relatively low, so the price is relatively economical. This gives carbon steel a competitive advantage in large-scale industrial applications.

Disadvantages:

• Corrosion tendency: Carbon steel is susceptible to oxidation and corrosion. When carbon steel is exposed to moisture or in contact with acidic substances, it is prone to corrosion, resulting in material damage. In order to reduce the risk of corrosion, it is usually necessary to treat carbon steel with corrosion protection or use a corrosion resistant coating.
• Low shock resistance: Compared with other high-strength alloy materials, the shock resistance of carbon steel is poor. Under earthquake or other vibration environment, carbon steel structure is prone to deformation or instability, which may lead to structural damage and safety hazards.

Galvanising is a surface treatment technique of plating a layer of zinc on the surface of metals, alloys or other materials to provide a beautiful and rust-resistant appearance. The colour of zinc after galvanising is silver-white, and the colour after passivation of galvanising can be white, coloured, army green, etc.