Is It Still Useful If the Expansion Screw Is Removed?

If the expanding screws removed are complete, they can theoretically be used. But are very few, so the expansion screw after the removal can not be used. The expansion screw is generally said to be a metal expansion screw, the expansion screw is fixed by using wedge slope to promote the expansion to produce frictional grip force, to achieve a fixed effect. The screws are threaded at one end and taper at the other. Outer bread a iron leather (some steel pipe), iron cylinder (steel pipe) half has a number of incisions, put them together into the wall hit the hole, and then lock nut, nut screw pulled out, the cone pulled into the iron cylinder, the iron cylinder is raised, so tightly fixed on the wall, generally used for guardrails, awnings, air conditioning and other cement, brick and other materials tight. However, its fixation is not very reliable, if the load has a large vibration, may be loose, so it is not recommended for the installation of ceiling fans, etc.

Reason: expansion screws are many and many kinds, material, expansion principle, use range and so on, some can be completely disassembled and re-used, but not all casing geckos can be used again. But the domestic use of more are Hebei-made simple expansion screws, the material is not very good, expansion coefficient can not be guaranteed, but because the screw steals more material, just can be removed to use again.