1) Slotted ordinary screws
More for connections to smaller parts. It has pan head screws, cylinder head screws, half countersunk screws and countersunk screws. The head screw and the head screw have higher strength and are connected to the common parts; the head of the semi-nunk head screw is curved, and its top end is slightly exposed after installation, and is beautiful and smooth, generally used for instruments or Precision machinery; countersunk screws are used to prevent the nail head from being exposed.
2) Hexagon socket and hexagon socket flower screw
The head of this type of screw can be embedded in the component, can apply a large torque, and has a high joint strength, which can replace the hexagonal bolt. Commonly used in joints where the structure is required to be compact and the appearance is smooth.
3) Cross recessed ordinary screws
It has similar functions to the slotted ordinary screws, and can be replaced with each other, but the grooved ordinary screw has a high trough strength, is not easy to be bald, and has a beautiful appearance. When using, it must be loaded and unloaded with the matching cross-shaped screwdriver.
The eyebolt is a hardware that is load-bearing for installation and transport. In use, the screw must be screwed into a position where the bearing surface is tightly fitted. It is not allowed to use the tool to tighten, nor is it allowed to have a load perpendicular to the plane of the lifting ring.
5) Set screws
The set screws are used to fix the relative position of the parts. Screw the set screw into the screw hole of the part to be tightened, and press the end to the surface of the other part, that is, fix the previous part to the next part.
The set screw is usually made of steel or stainless steel, and its tip shape is tapered, concave, flat, cylindrical and stepped. The end of the tapered end or the concave end of the set screw directly tightens the part, which is generally used for the installation after the installation; the end of the flat end set screw is smooth, and the surface of the part is not damaged after being tightened, and is used for frequently adjusting the position. At the joint, only a small load can be transmitted; the cylindrical end tightening screw is used to adjust the fixed position frequently, it can withstand large loads, but the anti-loose performance is poor, and the anti-loose measures should be taken when fixing; The set screw is suitable for fixing parts with large wall thickness.
6) Self-tapping screws
When the tapping screw is used on the coupled member, the threaded joint may not be pre-made. Use the screw to directly tap the thread when connecting. It is often used to join thin metal sheets. The varieties include taper tapping screws and flat end tapping screws.
7) Self-tapping locking screws
The self-tapping locking screw not only has self-tapping, but also has low screwing torque and high locking performance. Its thread has a triangular cross section, and the surface of the screw is hardened to have a high hardness. Its thread size is M2 ~ M12.
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