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  2. List of screw and bolt types - Wikipedia

    en.wikipedia.org/wiki/List_of_screw_and_bolt_types

    The screw itself should be drilled a minimum of 1" into the concrete to hold effectively and a maximum of 1-3/4" or the threads will wear and will lose holding power. Ideally 1-1/4" to 1-1/2" of screw thread in the concrete. [1] So for example, if a 1/2" board is being screwed onto the concrete, a 1-3/4" to 2" concrete screw should be used ...

  3. Confirmat screw - Wikipedia

    en.wikipedia.org/wiki/Confirmat_screw

    Confirmat screws on a sheet of the particleboard material in which they were designed to hold. Diagram of a hex-headed confirmat screw, made to be turned with an allen key A confirmat screw holding a butt joint in melamine-coated particleboard. A specialized stepped drill bit and a screw to match it. The screw is covered with a cosmetic plastic ...

  4. 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 ...

  5. United States Standard thread - Wikipedia

    en.wikipedia.org/wiki/United_States_Standard_thread

    William Sellers originally developed the USS thread, and set forth many of its details in his paper, "A System of Screw Threads and Nuts", presented in April 1864 to the Franklin Institute. In 1898, the standard for metric threaded fasteners was established. [5]

  6. Toolstation - Wikipedia

    en.wikipedia.org/wiki/Toolstation

    Toolstation is a multi-channel retailer of tools and building materials. It has more than 500 branches in the UK, 90 in the Netherlands, 23 in France and 19 in Belgium. It has more than 500 branches in the UK, 90 in the Netherlands, 23 in France and 19 in Belgium.

  7. Robertson screw - Wikipedia

    en.wikipedia.org/wiki/Robertson_screw

    Robertson screwdrivers are easy to use one-handed, because the tapered socket tends to retain the screw, even if it is shaken. [3]: 85–86 They also allow the use of angled screwdrivers and trim-head screws. The socket-headed Robertson screws are self-centering and reduce cam out. They also stop a power tool when set, and can be more easily ...

  8. Glossary of construction cost estimating - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_construction...

    A Allocation of costs is the transfer of costs from one cost item to one or more other cost items. Allowance - a value in an estimate to cover the cost of known but not yet fully defined work. As-sold estimate - the estimate which matches the agreed items and price for the project scope. B Basis of estimate (BOE) - a document which describes the scope basis, pricing basis, methods ...

  9. Screw - Wikipedia

    en.wikipedia.org/wiki/Screw

    A lathe of 1871, equipped with leadscrew and change gears for single-point screw-cutting A Brown & Sharpe single-spindle screw machine. Fasteners had become widespread involving concepts such as dowels and pins, wedging, mortises and tenons, dovetails, nailing (with or without clenching the nail ends), forge welding, and many kinds of binding with cord made of leather or fiber, using many ...

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