{
  "metadata": {
    "name": "Steel round bar theoretical weight table, 1–400 mm",
    "version": "2026-08-25",
    "unit": "kg/m",
    "density_kg_m3": 7850,
    "formula": "kg/m = pi / 4 * (diameter_mm / 1000)^2 * density_kg_m3",
    "scope": "Solid circular steel bar with nominal diameter; one-millimetre increments from 1 mm through 400 mm.",
    "limitation": "Theoretical geometric mass only. It does not include diameter tolerance, scale, decarburization, surface removal, end condition, or grade-specific measured density. Commercial settlement follows the accepted order.",
    "source": {
      "title": "Eurocodes: Background and Applications — Design of Steel Buildings",
      "publisher": "European Commission Joint Research Centre",
      "url": "https://eurocodes.jrc.ec.europa.eu/sites/default/files/2021-12/handbook3.pdf",
      "note": "Table 2 lists a unit mass of 7,850 kg/m³ for steel in design calculations."
    }
  },
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    {
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