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  2. Circular mil - Wikipedia

    en.wikipedia.org/wiki/Circular_mil

    1000 circular mils = 1 MCM or 1 kcmil, and is (approximately) equal to: 0.5067 mm 2, so 2 kcmil ≈ 1 mm 2 (a 1.3% error) Therefore, for practical purposes such as wire choice, 2 kcmil ≈ 1 mm 2 is a reasonable rule of thumb for many applications.

  3. Hardness comparison - Wikipedia

    en.wikipedia.org/wiki/Hardness_comparison

    300 76: 80-37: 287 References. Further reading ... "Metallic materials — Conversion of hardness values" (2013) ASTM E140-12B(2019)e1: "Standard Hardness Conversion ...

  4. IEC 60228 - Wikipedia

    en.wikipedia.org/wiki/IEC_60228

    Comparison of SWG (red), AWG (blue) and IEC 60228 (black) wire gauge sizes from 0.03 to 200 mm² to scale on a 1 mm grid – in the SVG file, hover over a size to highlight it. In engineering applications, it is often most convenient to describe a wire in terms of its cross-section area, rather than its diameter, because the cross section is directly proportional to its strength and weight ...

  5. Metric prefix - Wikipedia

    en.wikipedia.org/wiki/Metric_prefix

    Since the mid-1990s, kcmil has been adopted as the official designation of a thousand circular mils, but the designation MCM still remains in wide use. A similar system is used in natural gas sales in the United States: m (or M ) for thousands and mm (or MM ) for millions of British thermal units or therms , and in the oil industry, [ 30 ...

  6. Brinell scale - Wikipedia

    en.wikipedia.org/wiki/Brinell_scale

    5.0 HB (pure lead; alloyed lead typically can range from 5.0 HB to values in excess of 22.0 HB) Pure Aluminium: 15 HB Copper: 35 HB Hardened AW-6060 Aluminium: 75 HB Mild steel: 120 HB 18–8 (304) stainless steel annealed: 200 HB [3] Quenched and tempered steel wear plate: 400-700 HB Hardened tool steel: 600–900 HB (HBW 10/3000) Glass: 1550 ...

  7. Vickers hardness test - Wikipedia

    en.wikipedia.org/wiki/Vickers_hardness_test

    Vickers values are generally independent of the test force: they will come out the same for 500 gf and 50 kgf, as long as the force is at least 200 gf. [6] However, lower load indents often display a dependence of hardness on indent depth known as the indentation size effect (ISE). [ 7 ]

  8. List of viscosities - Wikipedia

    en.wikipedia.org/wiki/List_of_viscosities

    Measured values span several orders of magnitude. Of all fluids, gases have the lowest viscosities, and thick liquids have the highest. ... 300 18.5 400 23.1 500 27.1 ...

  9. Knoop hardness test - Wikipedia

    en.wikipedia.org/wiki/Knoop_hardness_test

    where: L is the length of indentation along its long axis C p is the correction factor related to the shape of the indenter, ideally 0.070279 P is the load. HK values are typically in the range from 100 to 1000, when specified in the conventional units of kg f ⋅mm −2.