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  2. 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

  3. British Standard Whitworth - Wikipedia

    en.wikipedia.org/wiki/British_Standard_Whitworth

    Certain branches of industry used Whitworth fasteners with a smaller hexagon (identical to BSF of the same bolt diameter) under the designation "AutoWhit" or Auto-Whit [citation needed] [7] and this series was formalised by the British Engineering Standards Association in 1929 as standard No. 193, with the 'original' series being No. 190 and ...

  4. List of screw and bolt types - Wikipedia

    en.wikipedia.org/wiki/List_of_screw_and_bolt_types

    An ASME B18.2.1 compliant cap screw has somewhat tighter tolerances than a hex bolt for the head height and the shank length. The nature of the tolerance difference allows an ASME B18.2.1 hex cap screw to always fit where a hex bolt is installed but a hex bolt could be slightly too large to be used where a hex cap screw is designed in.

  5. Screw thread - Wikipedia

    en.wikipedia.org/wiki/Screw_thread

    The common V-thread standards (ISO 261 and Unified Thread Standard) include a coarse pitch and a fine pitch for each major diameter. For example, 12-13 belongs to the UNC series (Unified National Coarse) and 12-20 belongs to the UNF series (Unified National Fine). Similarly, M10 (10 mm nominal outer diameter) as per ISO 261 has a ...

  6. 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). If the pitch is the normally used "coarse" pitch listed in ISO 261 or ...

  7. Bolt (fastener) - Wikipedia

    en.wikipedia.org/wiki/Bolt_(fastener)

    Elevator bolt - Bolt with a large flat head used in conveyor system setups. Hanger bolt - Bolt that has no head, machine threaded body followed by a wood threaded screw tip. Allow nuts to be attached to what is really a screw. Hex bolt - Bolt with a hexagonal head and threaded shank. Section immediately under head may be unthreaded for ...