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What Is An Expansion Bolt?

Oct. 19, 2019 | 12:37:04
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Expansion bolts are special threaded connections used to secure pipe supports/cranes/brackets or equipment to walls, floors, and columns. The expansion bolt is composed of a countersunk bolt, a expansion tube, a flat washer, a spring washer and a hex nut. The main difference between the hex nut and the Ring Nuts is the shape.


The fixing principle of the expansion screw: the fixing of the expansion screw is to use the slanting inclination to promote the expansion to produce a frictional grip force to achieve a fixed effect. The screw is threaded at one end and has a vertebra at the end. The outer bread has a steel skin, and the iron cylinder has a few cuts in half. Put them together into the hole in the wall, and then lock the nut. The nut pulls the screw outward and pulls the vertebra into the steel cylinder. The tube is opened, so it is tightly fixed on the wall, and is generally used for fastening the fence, awning, air conditioner and the like on cement, brick and the like. However, its fixing is not very reliable. If the load has a large vibration, looseness may occur, so it is not recommended to install a ceiling fan. The principle of the expansion bolt is to hit the expansion bolt into the hole on the ground or the wall surface, and then tighten the nut on the expansion bolt with a wrench, the bolt goes out, and the outer metal sleeve does not move, so the big head under the bolt is put The metal sleeve is opened so that it fills the entire hole, at which point the expansion bolt will not be pulled out. So how do you use the expansion bolt? As a Expansion Bolt Manufacturer, we can tell you how to use it.


When using, first use the impact drill (hammer) to drill the corresponding size hole on the fixed body, then insert the bolt and the expansion tube into the hole, and tighten the nut to make the bolt, the expansion tube, the mounting part and the fixed body The expansion is integrated into one.


After tightening, it will expand. There is a big head at the end of the bolt. The outer sleeve of the bolt is a round tube slightly larger than the diameter 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 tube. The pipe is made large to achieve the purpose of expansion, and then the bolt is fixed on the ground or the wall to achieve the purpose of rooting.


Anti Theft Nuts


Anti Theft Nuts


There are also some issues to be aware of when using expansion bolts:


1. Perforation depth: The depth of the concrete construction is preferably about 5 mm deeper than the length of the expansion tube. As long as it is greater than or equal to the length of the expansion tube, the length of the inner expansion bolt remaining in the ground is equal to or less than the length of the expansion tube.


2, the requirements of the inner expansion bolt on the ground, of course, the harder the better, it depends on the condition of the object you need to fix. The strength of the force installed in the concrete (C13-15) is five times that in the brick.


3. After properly installing an M6/8/10/12 inner expansion bolt in concrete, its optimal maximum static force is 120/170/320/510 kg. The installation method of the inner expansion bolt is not very difficult. The specific operation is as follows. First, select an alloy drill bit with the same diameter as the expansion screw (tube) of the expansion screw, and install it on the electric drill to drill the wall. The depth of the hole is preferably the same. The length of the bolts is the same, then the expansion screw kit is lowered into the hole together, remember; do not screw off the screw, to prevent the bolt from falling into the hole when the hole is drilled, and not to take it out. Then tighten the 2-3 button and feel the inner expansion bolt is tight and not loose, then unscrew the screw.


The above is the basic knowledge about expansion bolts. If you are interested in expansion bolts, you can contact us. We can also provide you with a variety of fasteners including Anti Theft Nuts.