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  2. Width across flats - Wikipedia

    en.wikipedia.org/wiki/Width_across_flats

    A few sizes are close enough to interchange for most purposes, such as 19 mm (close to 3 ⁄ 4 inch (19.05 mm)), 8 mm (close to 5 ⁄ 16 inch (7.94 mm)) and 4 mm (close to 5 ⁄ 32 inch (3.97 mm)). In reality, a wrench with a width across the flats of exactly 15 mm would fit too tightly to use on a bolt with a width across the flats of 15 mm.

  3. British Association screw threads - Wikipedia

    en.wikipedia.org/wiki/British_Association_screw...

    The major diameter is given by 6p 1.2, [4]: 12 rounded to two significant figures in mm and the hex head size (across the flats) is 1.75 times the major diameter. BA sizes are specified by the following British Standards: BS 57:1951 — B.A. screws, bolts and nuts

  4. Washer (hardware) - Wikipedia

    en.wikipedia.org/wiki/Washer_(hardware)

    Type B is a series of flat washers with tighter tolerances where outside diameters are categorized as "narrow", "regular" or "wide" for specific bolt sizes. [26] "Type" is not to be confused with "form" (but often is). The British Standard for Metric Series Metal Washers (BS4320), written in 1968, coined the term "form". The forms go from A to ...

  5. 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).

  6. Screw thread - Wikipedia

    en.wikipedia.org/wiki/Screw_thread

    Graphic representation of formulas for the pitches of threads of screw bolts A good summary of screw thread standards in current use in 1914 was given in Colvin FH, Stanley FA (eds) (1914): American Machinists' Handbook, 2nd ed, New York and London, McGraw-Hill, pp. 16–22. USS, metric, Whitworth, and BA standards are

  7. British Standard Whitworth - Wikipedia

    en.wikipedia.org/wiki/British_Standard_Whitworth

    British Morris and MG engines from 1923 to 1955 were built using metric threads with bolt heads and nuts dimensioned for Whitworth spanners and sockets. [13] In 1919, Morris Motors took over the French Hotchkiss engine works which had moved to Coventry during the First World War.

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