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  2. Preferred metric sizes - Wikipedia

    en.wikipedia.org/wiki/Preferred_metric_sizes

    Machine screws with different thread diameters Hex key set with metric sizes from 2 mm to 10 mm according to sizes for use with ISO 262 screw sizes (except 3.5 mm for M6 internal set screw) For each size bolt or screw and type of head, there is a corresponding size driver prescribed by various ISO standards, including:

  3. List of screw and bolt types - Wikipedia

    en.wikipedia.org/wiki/List_of_screw_and_bolt_types

    Inch-sized wood screws in the U.S. are defined by ANSI-B18.6.1-1981(R2003), while in Germany they are defined by DIN 95 (Slotted raised countersunk (oval) head wood screws), DIN 96 (Slotted round head wood screws), and DIN 97 (Slotted countersunk (flat) head wood screws). Security head screw: These screws are used for security purposes and ...

  4. Hex key - Wikipedia

    en.wikipedia.org/wiki/Hex_key

    Cap head screws of various sizes Button head screws Hex keys are best known as " Allen keys" or "Allen wrenches" in English-speaking countries like the UK, Australia, Canada and the U.S. and in Spanish-speaking countries such as Spain and Mexico (The "Allen" name is a registered trademark, originated by the Allen Manufacturing Company of ...

  5. Screw - Wikipedia

    en.wikipedia.org/wiki/Screw

    Flat head A screw with a flat head that requires countersinking so that it can be driven with the head flush with the surface it is screwed into. The angle of the screw is measured as the aperture of the cone. Oval or raised head A decorative screw head with a countersunk bottom and rounded top. [40] Also known as "raised countersunk" or ...

  6. List of screw drives - Wikipedia

    en.wikipedia.org/wiki/List_of_screw_drives

    Slot screw drives have a single horizontal indentation (the slot) in the fastener head and is driven by a "common blade" or flat-bladed screwdriver.This form was the first type of screw drive to be developed, and, for centuries, it was the simplest and cheapest to make because it can just be sawed or filed.

  7. Fastener - Wikipedia

    en.wikipedia.org/wiki/Fastener

    Hex head fasteners: Known for their high torque capacity, hex head fasteners are easily driven with a spanner or wrench, ideal for heavy-duty applications. Square head fasteners: Offering increased wrenching area and reduced risk of rounding off, square head fasteners are used in high torque applications.

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  9. Wrench size - Wikipedia

    en.wikipedia.org/wiki/Wrench_size

    Width across flats is the distance between two parallel surfaces on the head of a screw or bolt, or a nut, mostly for torque transmission by positive locking. The term width across flats (AF) is used for the following forms: 2-socket = round material with two surfaces; 4-socket = profile square section; 6-socket, 8-square = regular polygons