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Anchor bolts with external thread
Product description: External expansion screws (also known as external expansion bolts) are fasteners that provide a secure hold by expanding a sleeve. They are primarily used to attach objects to solid substrates, such as concrete or brick walls. They require no pre-installation and can b...
Description
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Product description:
External expansion screws (also known as external expansion bolts) are fasteners that provide a secure hold by expanding a sleeve. They are primarily used to attach objects to solid substrates, such as concrete or brick walls. They require no pre-installation and can be installed immediately after drilling. They are widely used in construction, home improvement, and industry.
Basic design and operating principle:
The design of an external expansion screw is based on "mechanical fastening by expansion," in which the clamping force is generated by relative movement between the components to achieve locking.
Basic design: It consists of four parts: a tapered screw stem, an expansion sleeve mounted on the stem, a flat washer, and a nut. The expansion sleeve typically has open grooves on its surface to facilitate expansion under load.
Operating principle:
First, drill a hole corresponding to the diameter of the expansion sleeve into the substrate (e.g., a concrete wall). Insert the screw and sleeve into this hole.
Tighten the nut with a wrench. This action forces the screw outward, where its tapered portion compresses the inner wall of the sleeve.
When compressed, the knurled sections expand outward, pressing tightly against the walls of the hole. This creates significant friction and clamping force, locking the bolt into the substrate and ultimately securing the object to the base material.
Materials and surface treatment:
The choice of materials and surface treatment primarily depends on the corrosive environment, substrate hardness and loading requirements.
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