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Anchor bolts

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Anchor bolts

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Expansion screws


Expansion screws

Expansion screws are generally said that the expansion of metal screws, expansion screws are used to promote the use of wedge gradient to produce friction grip wrapped force, to achieve a fixed effect. A screw is a thread, a head with a taper. Outside the bread (some tin pipe), iron cylinder (steel tube) has several half incision, put them together into the wall lay the hole, then the lock nut, the nut screw pull, pull cylinder taper iron, iron cylinder is open up, so tightly fixed on the wall, generally used for protection bar, awning, air conditioning and other fastening in the cement, bricks and other materials. But it's not very reliable fixed, if there is a large shock load, may loose, therefore it is not recommended for installation of ceiling fan etc..



 

Related tags: 膨胀螺丝,膨胀螺丝价格,膨胀螺丝批发

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