What are the types and applications of commonly used non-standard screws? (2)

Update: 15-09-2020

1. Externally forced internal thread non-standard screw […]

1. Externally forced internal thread non-standard screws, suitable for hanging water pipes, electric pipes, central air-conditioning pipes, and the fixing of various angle steels and channel steels.
2. Non-standard screws of twisted waterproof casing are used to fix lighting, light steel keel partition wall and bathroom equipment.
3. Hollow non-standard screws, suitable for fixing door frames, cabinet frames, shower room attached machinery and equipment and wall decorations.
Warm reminder: When using non-standard screws, you must first add a percussion drill (hammer) to the fixed hole of the fixed body, and then install the bolt and expansion tube into the hole, and tighten the nut to make the bolt and expansion tube , The installation part and the fixed body are expanded and tightened into one body. After tightening, it will swell. There is a big head at the end of the bolt. A round water pipe slightly larger than the diameter of the bolt is sleeved on the outside of the bolt. The end part has several openings. When the bolt is tightened, the end of the big head is sent. Go inside the open water pipe and push the water pipe bigger than the swelling destination, so that the bolts will not move on the road or wall, beyond the long root destination.