What are screw anchors?

منذ شهر السيارات الدلنجات   18 رأوه

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Power Driver Screw Anchors are inserts, typically made from plastic, metal, or fiber, which enable the attachment of screws into brittle materials — such as masonry or drywall. Known as wall plugs in the UK, screw anchors are available in many forms and offer anchoring solutions for different substrates at varying levels of strength.

The most common type of Power Driver Screw Anchor Socket Type is a tapered plastic tube that’s inserted into a closely fitting drilled hole and tapped flush with the surface with a hammer. A hole in the center of the tube receives the screw and, when tightened, it expands the tube radially outwards gripping the screw anchor against the wall of the hole. Typically, the tube has slits in the base to facilitate its expansion and ribs on the sides to prevent its rotation when tightening the screw.

Screw anchors were invented by John Joseph Rawlings, a British Engineer in 1910, who had been contracted by the British Museum to attach electrical fittings without causing damage to their masonry walls. In response to the absence of any alternative to chiseling a hole and hammering in a wooden block to nail or screw into, Rawlings solution was based on the concept, “expansion means grip”.

His Rawlplug was constructed from eight segments of jute arranged parallel to each other to form a cylinder and held together with glue, the segments expanded apart from each other when a Power Driver Screw Anchor Shaft Type was driven into the center of the cylinder.

The plastic screw anchor was invented in 1958 by Artur Fischer, a German inventor. The Fischer Fixings Company still makes the original design — Fischer Expansion plug S — a nylon anchor screw available in diameters of 4mm (1/8”) to 20mm (13/16”) for fixing light objects in concrete and solid masonry.


Couplings fall into two main categories: Material Flexing and Mechanical Flexing. The material flexible types obtain their flexibility from stretching or compressing a resilient material, such as rubber, or from the flexing of thin metallic discs or grid. Material flexing couplings do not require lubrication, with the exception of grid couplings.


The Eye Nuts are screwed together with a bolt or a screw to act as a fastening part. All Anchor Rods, Eyenuts&couplings that must be used in a manufacturing machine are classified into several types of carbon steel, stainless steel, and non-ferrous metals (such as copper) depending on the material. . The nut has the characteristics of easy installation, integrity, no need of washers, easy disassembly and reusability made of medium carbon steel.


Multi-helix Earth Anchor/lead Section is an extendable deep foundation system with helical bearing plates welded to a central steel shaft. Anchors are used in tension applications and piles are used in compression applications. Load is transferred from the shaft to the soil through these bearing plates.

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