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  2. Anchor bolt - Wikipedia

    en.wikipedia.org/wiki/Anchor_bolt

    Tapcon screws are a popular anchor that stands for self tapping (self threading) concrete screw. Larger diameter screws are referred to as LDT's. This type of fastener requires a pre-drilled hole—using a Tapcon drillbit—and are then screwed into the hole using a standard hex or phillips bit. These screws are often blue, white, or stainless ...

  3. Wall plug - Wikipedia

    en.wikipedia.org/wiki/Wall_plug

    As the screw enters the plug, the soft material of the plug expands conforming tightly to the wall material. Such anchors can attach one object to another in situations where screws, nails, adhesives, or other simple fasteners are either impractical or ineffective. Different types have different levels of strength, and can be used on different ...

  4. Molly (fastener) - Wikipedia

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

    A machine screw is screwed into the sleeve, causing the anchor to bend, expand, spread and grip against the inside of the hole or behind it (in hollow contexts such as drywall over stud cavities, or hollow doors). [1] Mollies come in various diameters and grip lengths (shank lengths) for different drywall thicknesses and to support different ...

  5. Anchor - Wikipedia

    en.wikipedia.org/wiki/Anchor

    An anchor is a device, normally made of metal, used to secure a vessel to the bed of a body of water to prevent the craft from drifting due to wind or current. The word derives from Latin ancora, which itself comes from the Greek ἄγκυρα (ankȳra). [2] [3] Anchors can either be temporary or permanent.

  6. Rail fastening system - Wikipedia

    en.wikipedia.org/wiki/Rail_fastening_system

    Rail anchor in use. Rail anchors, also called anticreepers, are spring steel clips that attach to the underside of the rail baseplate and bear against the sides of the sleepers to prevent longitudinal movement of the rail, either from changes in temperature or through vibration. Anchors may be attached and removed either by hand with hammers ...

  7. History of the anchor - Wikipedia

    en.wikipedia.org/wiki/History_of_the_Anchor

    Greeks were using mushroom anchors by 400 B.C. fashioned from a flattened stone with a hole drilled through the center and a triangular eyebolt at the crown for "tripping" the anchor out of its bed. [2] Roman iron anchors were in use from the republican period onwards. [3]

  8. Screw piles - Wikipedia

    en.wikipedia.org/wiki/Screw_piles

    Modern screw pile design is based on standard structural and geotechnical principles. Screw pile designers typically use their own design software which has been developed through field testing of differing compression pile and tension anchor configurations in various soil profiles. Corrosion is addressed based on extended field trials ...

  9. Ice screw - Wikipedia

    en.wikipedia.org/wiki/Ice_screw

    An ice screw. Some modern screws like this one now have a handle to assist entry and removal, whereas early models did not. An ice screw is a threaded tubular screw used as a running belay or anchor by climbers on steep ice surface such as steep waterfall ice or alpine ice during ice climbing or crevasse rescue, to hold the climber in the event of a fall, and at belays as anchor points.

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