An anchor refers to a fastener used to attach one object to another object or in a stationary location in circumstances where other devices, such as screws or nails, might not be effective. A toggle bolt is a kind of hollow-wall anchor.
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Hollow-wall anchors are fasteners that do not attach properly to solid objects or materials. Hollow-wall anchors spread within the hollow area of the wall, stopping the anchor from being pulled free through the original installation hole.
Toggle bolt anchors consist of a toggle and screw. The top end of the toggle consists of a loaded wing nut, designed to expand upon insertion into a hole. The body of the toggle acts as a standard machine screw, a cylinder-shaped fastener with a helical ridge that enables the bolt to hold together objects. Toggle bolts are often used to hang an object, such as a plant, from a ceiling.
The strength of the toggle bolt is determined by the length and diameter of its screw body. A 3.25 mm (1/8 inch) toggle screw, for example, is able to hold a 22.5 kg (50 lb) object on 1.25 cm (1/2 inch) thick plasterboard. A 9.75 mm (3/8 inch) toggle is capable of supporting 45 kg (100 lb).