on-standard screw types and applicable occasions:
Non-standard screws
(1) Embedded screws are mainly used for the suspension and fixation of air-conditioning pipes, water pipes, electric pipes, and ceilings.
(2) Non-standard screws with torsional flat heads can be used on cement concrete, brick walls and hollow bricks, etc., for the fixing of sanitary equipment.
(3) Internal non-standard internal tooth screws for fixing marble, water pipes, electric tubes, and angle irons.
(4) Sleeve type non-standard screws, mainly used for the fixing of soundproof walls and bathroom equipment.
(5) External non-standard external-tooth screws, mainly used for water pipes, electric pipes, air-conditioning suspension pipes, and a variety of angle iron, steel fixed.
(6) Torsion-type casing non-standard screws used for fixing lighting, light steel dragon skeletons and bathroom equipment.
(7) Hollow non-standard screws, suitable for the fixing of door frames, cabinet frames, bathroom accessories, and wall decorations.
When using non-standard screws, first use the impact drill (hammer) in the corresponding size of the hole in the fixed body, and then bolts, expansion tubes into the hole, tighten the nut bolts, expansion tubes, mounting parts and fixed body Between the expansion into one. After being tightened, it will expand. There is a big head at the tail of the bolt. A round pipe with a diameter slightly larger than the bolt is put on the outside of the bolt. There are several openings in the tail part. When the bolt is tightened, the tail of the big head is brought into the open pipe. The purpose of the rooting is to fix the bolts on the ground or the wall by rushing the tube and expanding it.