Expansion Bolt Principle

The fixing principle of expansion bolts: Expansion bolts are fixed by using a tapered angle to induce expansion, generating friction and gripping force to achieve a fixing effect. One end of the bolt is threaded, and the other end is tapered. It is encased in a steel sleeve, half of which has several slits. These are inserted together into a pre-drilled hole in the wall, and then the nut is tightened. The nut pulls the bolt outward, drawing the tapered end into the steel sleeve, causing the sleeve to expand and thus firmly fixing it to the wall. It is commonly used for securing guardrails, awnings, air conditioners, etc., to materials such as cement and brick. However, its fixing is not entirely reliable; if the load experiences significant vibration, it may loosen. Therefore, it is not recommended for installing ceiling fans, etc. The principle of expansion bolts is that after driving the expansion bolt into a hole in the ground or wall, tightening the nut on the expansion bolt with a wrench causes the bolt to move outward, while the outer metal sleeve remains stationary. The larger end of the bolt then expands the metal sleeve, filling the entire hole, at which point the expansion bolt cannot be pulled out.