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  2. Ring size - Wikipedia

    en.wikipedia.org/wiki/Ring_size

    Originally in 1945, the divisions were based on the ring inside diameter in steps of 1 ⁄ 64 inch (0.40 mm). [6] However, in 1987 BSI updated the standard to the metric system so that one alphabetical size division equals 1.25 mm of circumferential length. For a baseline, ring size C has a circumference of 40 mm. [7]

  3. ISO 5775 - Wikipedia

    en.wikipedia.org/wiki/ISO_5775

    The inner width of the rim on which the tire is mounted should be about 65% of the tire's nominal section width for tires smaller than 30 mm and 55% for those larger. The section height of a tire is usually identical to its section width (for tires less than 28 mm, 2.5 mm have to be added to the width to get the height).

  4. 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.

  5. Body jewelry sizes - Wikipedia

    en.wikipedia.org/wiki/Body_jewelry_sizes

    But with body jewelry, there is a wide variety of possible sizes, and wearers generally want jewelry that is the same size as their piercing site. Some wearers want increasingly larger sizes to deliberately stretch the hole. So that wearers can choose the size they want, there are standards for body jewelry sizes, used by jewelry makers and ...

  6. Ring gauge - Wikipedia

    en.wikipedia.org/wiki/Ring_gauge

    A ring gauge, or ring gage, is a cylindrical ring of a thermally stable material, often steel, whose inside diameter is finished to gauge tolerance and is used for checking the external diameter of a cylindrical object. [1] Ring gauges are used for comparative gauging as well as for checking, calibrating, or setting of gauges or other standards ...

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