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  2. Anchor bolt - Wikipedia

    en.wikipedia.org/wiki/Anchor_bolt

    torque controlled: the anchor is inserted into the hole and secured by applying a specified torque to the bolt head or nut with a torque wrench. A particular sub-category of this anchor is called wedge type. As shown in the figure, tightening the bolt results in a wedge being driven up against a sleeve, which expands it and causes it to ...

  3. Rail fastening system - Wikipedia

    en.wikipedia.org/wiki/Rail_fastening_system

    Fang bolts or rail anchor bolts have also been used for fixing rails or chairs to sleepers. The fang bolt is a bolt inserted through a hole in the sleeper with a fanged nut that bites into the lower surface of the sleeper. For fastening flat-bottomed rails, an upper-lipped washer can be used to grip the edge of the rail.

  4. Molly (fastener) - Wikipedia

    en.wikipedia.org/wiki/Molly_(fastener)

    Figure 1 of the original patent for the molly bolt, U.S. Patent No. 2,018,251. The molly bolt was patented in 1934 by George Frederick Croessant. [3] Although his patent acknowledges that expandable fasteners of this general kind were already known, Croessant's patent is intended to provide "an improved and adequate anchoring grip that may be retightened if necessary and that will permit ...

  5. Anchor channel - Wikipedia

    en.wikipedia.org/wiki/Anchor_channel

    Anchor channels, invented by Anders Jordahl in 1913, are steel channels cast flush in reinforced concrete elements to allow the installation of channel bolts for the fastening of components. Anchor channels consist of steel C-shaped channels and anchors (mostly headed studs ) which are connected to the channel by welding or riveting/forging.

  6. List of screw and bolt types - Wikipedia

    en.wikipedia.org/wiki/List_of_screw_and_bolt_types

    anchor bolt: A special type of bolt that is set into concrete, with screw threads protruding above the concrete surface to accept a nut. breakaway bolt: A breakaway bolt is a bolt with a hollow threaded shank, which is designed to break away upon impact. Typically used to fasten fire hydrants, so they will break away when hit by a car. Also ...

  7. .dwg - Wikipedia

    en.wikipedia.org/wiki/.dwg

    DWG (from drawing) is a proprietary [3] binary file format used for storing two- and three- dimensional design data and metadata.It is the native format for several CAD packages including DraftSight, AutoCAD, ZWCAD, IntelliCAD (and its variants), Caddie and Open Design Alliance compliant applications.

  8. Washer (hardware) - Wikipedia

    en.wikipedia.org/wiki/Washer_(hardware)

    Being visible, many anchor plates are made in a style that is decorative. [5] Torque washer Used in woodworking in combination with a carriage bolt; it has a square hole in the centre into which the carriage bolt square fits. Teeth or prongs on the washer bite into the wood, preventing the bolt from spinning freely when a nut is being tightened ...

  9. Hold down (structural engineering) - Wikipedia

    en.wikipedia.org/wiki/Hold_down_(structural...

    A hold-down may also refer to clamping device used to anchor a pipe to a structural steel element or concrete floor or allow movement of the pipe in an axial direction. [1] At the bottom, the hold down is connected to the concrete foundation or structural slab by an embedded or epoxied anchor bolt. At the top, the hold down is connected to a ...