Inner hexagonal step copper screw, straight pattern step screw, camera screw M2 M3

Fasteners are classified into different types based on their purpose, and new types of fasteners are developed according to the needs of special environments to meet the needs of various industries. As a common type of fastening bolt, gasket combination bolts protect the surface of the connected parts from scratches, disperse the pressure on the connected parts, and have a sealing and anti loosening effect. With the continuous improvement of environmental requirements, new zinc aluminum coating surface treatment has gradually become the mainstream surface treatment process due to its compliance with environmental requirements, beautiful surface, and higher corrosion resistance than galvanized nickel surface treatment.

Pins are widely used in the connection of rotating mechanisms between two moving components, such as crank mechanisms, flipping mechanisms, hydraulic cylinders, and moving parts. Cylindrical pins are currently the most commonly used type on equipment. In order to ensure the normal use of the operating equipment and prevent the cylindrical pin from slipping out or falling off during use, some anti falling methods are usually used at the head of the pin, such as drilling and inserting a split pin to prevent the pin from slipping out; 2. Use external threads to tighten with nuts to prevent the pin from slipping out; 3. Clamp the slot with a snap ring to prevent detachment, etc. These measures make cylindrical pins very practical in situations where they are not frequently disassembled. However, during actual use on site, some equipment needs to be pulled out and flipped up to prevent collisions during each troubleshooting or maintenance. After the malfunction or maintenance is completed, the pin can be inserted again. This process will cause trouble for actual operators, such as bringing special tools with them every time the pin is disassembled, The split pin or circlip is easily damaged after multiple disassembly and assembly, and operators sometimes use iron wire to thread or tie it tightly to save time. Even for the sake of speed and convenience, they simply do not disassemble the pin, which is easy to cause damage to the equipment when dealing with faults.

Pins are frequently used parts in the mechanical industry, especially in the mold manufacturing industry. With the development of the mold industry, the precision of mold manufacturing and assembly is becoming higher and higher, and people are increasingly pursuing high-quality and close to the mold. Every detail on the mold is constantly being improved, and the high-frequency use of pins forces people to find safer, simpler, and more reliable ways to disassemble and assemble.

Flat washers are frequently used in mechanical connections and are usually placed between nuts or screw heads and the connected parts to prevent screws or nuts from loosening during use. The upper and lower end faces of conventional flat gaskets are mostly smooth planes with a single structure and poor compressive strength. When assembling with nuts or screws, the pressure on the flat gasket increases, and it is prone to fracture when tightly fitting and rubbing with the nuts or screws, greatly affecting the quality of the product.

There is one standard for outer hexagonal bolts, which is the level standard, which is divided into 4.8 and 8.8 levels. These two levels are particularly commonly used in the market. Especially for grade 4.8 outer hexagonal bolts. Because it is much cheaper than grade 8.8 outer hexagonal bolts. Of course, it is more widely used. But for products with high requirements. Due to its high requirements in various aspects such as hardness. This requires the use of grade 8.8 outer hexagonal bolts. Grade 8.8 outer hexagonal bolts are harder in terms of hardness and screw torque. For safer use of products. Faster and more stable.