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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 Standard Whitworth - Wikipedia

    en.wikipedia.org/wiki/British_Standard_Whitworth

    4 Spanner (Wrench) size. Toggle Spanner (Wrench) size subsection. 4.1 List of hex head sizes. 5 Comparison with other standards. ... 78: 1.480 37.6 1.300 33.0 36 ...

  4. Wrench - Wikipedia

    en.wikipedia.org/wiki/Wrench

    A set of metric spanners or wrenches, open at one end and box/ring at the other. These are commonly known as “combination” spanners. A wrench or spanner is a tool used to provide grip and mechanical advantage in applying torque to turn objects—usually rotary fasteners, such as nuts and bolts—or keep them from turning.

  5. Adjustable spanner - Wikipedia

    en.wikipedia.org/wiki/Adjustable_spanner

    An adjustable spanner (UK and most other English-speaking countries), also called a shifting spanner (Australia and New Zealand) [1] or adjustable wrench (US and Canada), [a] is any of various styles of spanner (wrench) with a movable jaw, allowing it to be used with different sizes of fastener head (nut, bolt, etc.) rather than just one fastener size, as with a conventional fixed spanner.

  6. British Standard Fine - Wikipedia

    en.wikipedia.org/wiki/British_Standard_Fine

    1 + 78: 28.75 mm 1 + 1 ... Jaw sizes for sockets and spanners/wrenches; Spanner size chart This page was ...

  7. List of screw drives - Wikipedia

    en.wikipedia.org/wiki/List_of_screw_drives

    A square screw drive uses four-sided fastener heads which can be turned with an adjustable wrench, open-end wrench, or 8- or 12-point [67] sockets. Common in the 19th and early 20th centuries, when it was easier and cheaper to manufacture than most other drives, it is less common today (although still easy to find) because the external hex is ...