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Expansion bolts (also called anchor bolts or expansion anchors) are mechanical fasteners used to secure objects to hard base materials like concrete, brick, or stone. They consist of a threaded bolt, an outer expansion sleeve (cone), a washer, and a nut. During installation, tightening the nut pulls the cone into the sleeve so that it expands outward, generating strong friction against the hole wall and locking the anchor securely in place. Handan Hangfan Metal Products Co., Ltd. is a leading fastener manufacturer in China, offering high-quality expansion anchors and a full range of fastening solutions for global customers.