Torque Performance: Carbon steel has high strength and can withstand large torque. However, ordinary carbon steel is prone to rust, so its surface usually requires treatments such as galvanizing or blackening. After treatment, the torque transmission of carbon steel fasteners is basically the same as that of untreated ones. However, if the coating is damaged during installation, it may affect the precise control of torque.

Anti-slip Performance: The surface friction of carbon steel fasteners is moderate, and their anti-slip performance is average. In some vibrating environments, if no additional anti-loosening measures are taken (such as using spring washers or thread lockers), loosening is likely to occur.

Torque Performance: Stainless steel has good corrosion resistance and certain strength, and its torque transmission capacity is similar to that of carbon steel. However, different types of stainless steel (such as 304, 316, etc.) have slight differences in strength and hardness. 316 stainless steel has slightly higher strength and can withstand relatively larger torque. During the tightening process of stainless steel fasteners, due to their relatively soft material, thread deformation may occur, affecting torque accuracy.

Anti-slip Performance: The surface of stainless steel is relatively smooth with a small friction coefficient, so its anti-slip performance is not as good as that of carbon steel. In occasions requiring high anti-slip performance, special surface treatments (such as knurling or sandblasting) may be needed for stainless steel fasteners to increase surface roughness and improve anti-slip ability.

Torque Performance: Copper has relatively low hardness, and its torque-bearing capacity is lower than that of carbon steel and stainless steel. However, copper has good electrical and thermal conductivity. In some special occasions, such as electrical equipment, copper fasteners are used even if the torque requirement is not high. Due to the soft texture of copper, torque must be controlled during tightening to avoid thread damage caused by over-tightening.

Anti-slip Performance: The surface of copper is relatively smooth, resulting in poor anti-slip performance. However, in some electrical connections, surface treatments such as tin plating are usually adopted to improve contact performance and provide a certain degree of anti-slip ability. Meanwhile, special tools and methods are used during installation to ensure connection reliability and reduce problems caused by insufficient anti-slip performance.

Torque Performance: Plastic fasteners are lightweight and corrosion-resistant but have low strength and can only withstand small torque. They are generally suitable for occasions with low torque requirements that need insulation or corrosion resistance, such as electronic products and toys. When tightening plastic fasteners, special low-torque tools must be used to prevent plastic deformation or cracking due to excessive torque.

Anti-slip Performance: The anti-slip performance of plastic fasteners varies depending on the material and surface treatment. Some plastic surfaces have certain elasticity and friction, providing good anti-slip effects under specific conditions. However, under vibration or long-term stress, plastic may creep, leading to connection loosening. Therefore, other anti-loosening measures are usually required, such as using plastic nut locks or applying anti-slip agents on threads.

Torque Performance: Nylon is a commonly used engineering plastic, and its torque performance is similar to that of general plastics, with limited torque-bearing capacity. However, nylon has good wear resistance and self-lubrication, which gives nylon fasteners certain application advantages in occasions requiring reduced friction and wear, such as internal connections of small machinery.

Anti-slip Performance: The surface friction coefficient of nylon is relatively high, resulting in good anti-slip performance. Its self-lubrication can reduce heat and wear caused by friction to a certain extent, helping maintain connection stability. However, compared with metal materials, the anti-slip performance of nylon decreases under high temperature and high load conditions.