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  2. 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 ...

  3. Safe room - Wikipedia

    en.wikipedia.org/wiki/Safe_room

    More expensive safe rooms have walls and a door reinforced with sheets of steel, Kevlar, or bullet-resistant fiberglass. The hinges and strike plate are often reinforced with long screws. Some safe rooms may also have externally vented ventilation systems and a separate telephone connection. They might also connect to an escape shaft.

  4. Threaded insert - Wikipedia

    en.wikipedia.org/wiki/Threaded_insert

    TIME-SERT insert. A threaded insert, also known as a threaded bushing, is a fastener element that is inserted into an object to add a threaded hole. [1] They may be used to repair a stripped threaded hole, provide a durable threaded hole in a soft material, place a thread on a material too thin to accept it, mold or cast threads into a work piece thereby eliminating a machining operation, or ...

  5. Hollow-core slab - Wikipedia

    en.wikipedia.org/wiki/Hollow-core_slab

    Hollow-core slabs and wall elements without prestressed steel wire can be formed by extruders. The size of these elements will typically range in width from 600 to 2400 mm, in thickness from 150 to 500 mm, and can be delivered in lengths of up to 24 m. [1] The voids of the hollow core can be used as conduit for installations.

  6. Door - Wikipedia

    en.wikipedia.org/wiki/Door

    Core material: Material within the door used simply to fill space, provide rigidity and reduce druminess. Hollow-core – Often consists of a lattice or honeycomb made of corrugated cardboard, extruded polystyrene foam, or thin wooden slats. Can also be built with staggered wooden blocks. Hollow-core molded doors are commonly used as interior ...

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