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2. Screw - Wikipedia

   en.wikipedia.org/wiki/Screw

   An assortment of screws, and a US quarter for size comparison A wood screw: a) head; b) non-threaded shank; c) threaded shank; d) tip The six classical simple machines. A screw is an externally helical threaded fastener capable of being tightened or released by a twisting force to the head. The most common uses of screws are to hold objects ...

3. List of screw and bolt types - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_and_bolt_types

   Similar to a wood screw, except that it is generally much larger running to lengths up to 15 in (381 mm) with diameters from 0.25–0.5 in (6.35–12.70 mm) in commonly available (hardware store) sizes (not counting larger mining and civil engineering lags and lag bolts) and it generally has a hexagonal drive head.

4. Furniture screw - Wikipedia

   en.wikipedia.org/wiki/Furniture_screw

   A Chinese study published in 2019 which compared different types of screws used in medium density fiberboards (MDF) for furniture purposes found that the most important factor for how well a screw worked was the depth of the screw, and secondly the diameter of the hole. The screw type itself, however, had the least effect on the strength of the ...

5. List of screw drives - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_drives

   In Japan, the male sizes are often designated as DTC-20, DTC-27, DTC-40 (discontinued) and DTC-45 corresponding to a respective screw head size of 3.2 mm, 4.6 mm, 6.4 mm and 7.7 mm; with the size of the screw measured across the widest portion of the mating part of the head. The most common sizes in use for consumer electronics are DTC-20 and ...

6. Screw thread - Wikipedia

   en.wikipedia.org/wiki/Screw_thread

   For a screw, this is its outside diameter (OD). The major diameter of a nut cannot be directly measured (as it is obstructed by the threads themselves) but it may be tested with go/no-go gauges. The major diameter of external threads is normally smaller than the major diameter of the internal threads, if the threads are designed to fit together.

7. Confirmat screw - Wikipedia

   en.wikipedia.org/wiki/Confirmat_screw

   Ordinary wood screws do not hold well in particleboard, which is much weaker than wood. They tend to tear out. [6] Confirmat screws have about twice the shank diameter of a woodscrew. Drywall screws, while half the price of confirmat screws, do not hold as well in particleboard-like materials, and cannot be removed and re-inserted.