Nominal specifications
Basic geometry is kept separate from manufacturer tolerances, fit and application. A matching nominal size does not establish interchangeability.
Insert reference method →About the reference
Follow the fact back to its source.
Use the value together with its units, conditions and evidence scope.
Manufacturer examples
Product claims belong to a complete designation, grade and source. A family illustration is not an exact product photograph.
Explore documented examples →Calculations
Inputs, units and formulas accompany the result. Estimates are labelled; a calculation does not replace product or inspection requirements.
Use a calculator →Source scope
Source links and review dates describe what was checked. They do not imply certification or full review of a paywalled standard.
Example: surface-quality sources →Reference updates
— Reorganized the homepage around lookup, comparison, calculation and marking guides. Added the calculator directory and a source-linked surface-quality path: Ra explanation, unit conversion and measurement conditions.
The 37 scoped surface-quality, size/fit, geometric-requirement and inspection URLs have been reviewed individually and connected to the reference directory. Unsupported numeric tables have been replaced with documented examples or explicit-input tools. The 170 existing material content pages (169 material references and one comparison article) have also been reviewed and rebuilt. Eleven references contain specific property examples; 157 establish identity and state scope, and one needs a more precise material identity. Read the material review decisions. Nine existing material-support pages now distinguish treatment states and source-scoped thermal expansion. Each page keeps its evidence scope and limitations visible.
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Include the page URL, the affected field, the proposed correction and a primary-source reference.
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