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Post-expansion mechanical anchors (also known as self-cutting mechanical anchors) belong to heavy-duty mechanical anchoring fasteners. They are divided into two structural types: single-tube and double-tube, and are a 细分品类 (subcategory) of mechanical anchors. They are mainly used for heavy-duty anchoring in concrete structures and are core fasteners for building curtain walls, steel structure installation, and equipment foundation fixing, especially suitable for engineering scenarios with anti-seismic and high-load requirements.