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2. Screw - Wikipedia

   en.wikipedia.org/wiki/Screw

   A machine screw is a small fastener less than 1 ⁄ 4 inch (6.35 mm) in diameter similar to a bolt, but which usually has a recessed drive type (slotted, Phillips, etc.) on its head to allow turning it with a screwdriver. Machine screws are threaded the entire length of the shank, and are intended to screw into a pre-formed thread in either a ...

3. Unified Thread Standard - Wikipedia

   en.wikipedia.org/wiki/Unified_Thread_Standard

   The number series of machine screws has been extended downward to include #00-90 (0.047 in = 0.060 in − 0.013 in) and #000-120 (0.034 in = 0.060 in − 2 × 0.013 in) screws; [3] however, the main standard for screws smaller than #0 is ANSI/ASME standard B1.10 Unified Miniature Screw Threads. This defines a series of metric screws named after ...

4. List of screw and bolt types - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_and_bolt_types

   Square head cap screws up to and including 3 ⁄ 4 inch (19.05 mm) have a head 1 ⁄ 8 inch (3.175 mm) larger than the shank; screws larger than 3 ⁄ 4 inch (19.05 mm) have a head 1 ⁄ 4 inch (6.35 mm) larger than the shank. [9] In 1919, Dyke defined them as screws that are threaded all the way to the head. [10] socket screw

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   Discover the latest breaking news in the U.S. and around the world — politics, weather, entertainment, lifestyle, finance, sports and much more.

6. List of screw drives - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_drives

   Example of a combination drive system. At center, a Torx T25/slot Dual Drive screw; at left, a 3 ⁄ 16-inch (4.8 mm) flat-blade screwdriver; at right, a T25 screwdriver. The screw will accept either screwdriver. Some screws have heads designed to accommodate more than one kind of driver, sometimes referred to as combo-head or combi-head.

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. ISO metric screw thread - Wikipedia

   en.wikipedia.org/wiki/ISO_metric_screw_thread

   A metric ISO screw thread is designated by the letter M followed by the value of the nominal diameter D (the maximum thread diameter) and the pitch P, both expressed in millimetres and separated by a dash or sometimes the multiplication sign, × (e.g. M8-1.25 or M8×1.25).

9. Set screw - Wikipedia

   en.wikipedia.org/wiki/Set_screw

   A set screw is often headless and threaded along its entire length, so that it will sit entirely inside that hole; in which case it may be called a grub screw or blind screw. Once fully and firmly screwed into the first object, the projecting tip of the set screw presses hard against the second object, acting like a clamp .