The concave cross hexagon combination screw, also known as the cross groove concave hexagon head combination screw or cross groove hexagon combination screw, is a fastener composed of a cross groove hexagon bolt, a flat washer, and a spring washer. The following is a detailed introduction to the concave cross hexagon combination screw:
1, Structural characteristics
External hexagon bolt: With a hexagonal head, it is easy to tighten with a wrench or socket. The bolt head has a cross groove and can be driven using a screwdriver or power tool.
Flat washer: located between the bolt and the connecting piece, used to increase the contact area, disperse pressure, and prevent the surface of the connecting piece from being scratched or damaged.
Spring washer: located between the flat washer and the bolt, providing additional elasticity to prevent the bolt from loosening under vibration or impact.
2, Common specifications
There are various specifications for concave cross hexagon combination screws, and common thread specifications include M3, M4, M5, M6, M8, etc. The length range is usually between 5mm and 90mm. The specific specification selection depends on the requirements of the connectors and the installation environment.
3, Material and hardness grade
Material: The concave cross hexagonal combination screw can be made of carbon steel or stainless steel. Stainless steel material has good corrosion resistance and strength, suitable for humid or corrosive environments.
• Hardness level: Screws made of carbon steel typically have different hardness levels, such as 4.8 and 8.8. 8.8 grade screws have high strength and hardness, making them suitable for situations that require bearing large loads.
4, Application and advantages
Widely used: Concave cross hexagonal combination screws are widely used in mechanical equipment, furniture, electronic devices, automobiles, and other fields to fix and connect various components.
Easy installation: Due to the cross groove, it can be quickly installed using a screwdriver or power tool, improving work efficiency.
Reliable fastening: By combining flat washers and spring washers, the stability and reliability of the connection are enhanced, preventing loosening.
5, Precautions
• Choose appropriate specifications: Select appropriate specifications and materials based on the requirements of the connectors and installation environment.
Correct installation: Ensure that the flat washer and spring washer are placed correctly to avoid misalignment or omission.
Regular inspection: For equipment that is used for a long time, the fastening of the connecting parts should be checked regularly. If there is any looseness, the screws should be tightened or replaced in a timely manner.
In summary, the concave cross hexagonal combination screw is a compact, easy to install, and reliable fastener widely used in various machinery and equipment. When selecting and using, appropriate specifications and materials should be chosen based on actual needs and installation environment.
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