Expansion Screw Anchor

Expansion screw anchor is a fastener used to secure an object to a hard material such as concrete, masonry, etc. It works based on the principle of expansion. It usually consists of a screw, an expansion tube and a nut. When the Expansion Screw Anchor is inserted into a pre-drilled hole and the nut is tightened, the screw moves upward, causing the expansion tube to be squeezed and expand outward. The expansion tube is in close contact with the wall of the hole, thus generating friction and anchoring force to firmly fix the object in the installation position. It can be used in a wide range of base materials, such as concrete, masonry, rock, etc., and can be adapted to different installation environments, including indoor, outdoor, dry, and wet environments. At the same time, a wide range of specifications and materials are available to meet the fixing needs of objects ranging from light to heavy.

Specific types of expansion screw anchors include ordinary expansion bolts and internal expansion bolts. Ordinary expansion bolts are fixed by the friction between the expansion piece and the hole wall. Internal expansion bolts are fixed by injecting high-pressure gas or liquid to expand the shell of the screw, which then grips the hole wall to realize the fixing effect.

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