SpecBase

Disclaimer and licence

Short version: use these numbers to estimate and to check, not to certify. The detail below explains where exactly that line sits, because the difference matters more for a weight table than it does for most reference material.

Estimating aid, not a design authority

The central limitation

Weight is a mass property. It says nothing about whether a part is strong enough, stiff enough, or safe — those are strength, deflection and fatigue questions that require the material’s mechanical properties, the geometry’s section properties and the actual load case. Nothing on this site addresses any of them, and no weight figure can.

Similarly, a wall thickness is not a pressure rating. Selecting a pipe schedule for a pressure service is a calculation governed by a piping code — ASME B31.3 for process piping, B31.1 for power, B31.9 for building services — that takes the design pressure and temperature, a corrosion allowance, the manufacturing tolerance, a weld joint factor and the material’s allowable stress at temperature. This site tells you what each schedule weighs and what bore it leaves, after the code has chosen it.

What we publish, and what we do not

Published

  • Cross-sectional areas come from closed-form geometry, not from a table.
  • Weights are computed as area × length × density, so they are exact for the dimensions and density you supply.
  • Unit conversions use definitional constants only.
  • Pipe outside diameters and wall thicknesses, which are the dimensional facts governed by ASME B36.10M-2018 and ASME B36.19M-2018.
  • Nominal densities from the material specification named in each entry — the full list is in the source table on methodology.

Not published, and never claimed

  • We are not a substitute for the standard. Purchase and design against the standard itself.
  • Nominal density is not a mill certificate. Wrought material varies; cast material varies more.
  • Weight is not a strength or pressure rating. Nothing here tells you whether a part is safe.
  • Section-property tables for named structural shapes (UPN, IPE, HEA, AISC C/MC) belong to the mills and standards that publish them; the parametric series on this site is for estimating only.
  • No standard’s text, notes, tables of tolerances or commentary is reproduced anywhere on this site. Where a standard is the authority, we cite it and link to it.
  • No section properties (second moment of area, section modulus, radius of gyration). Those belong to the mill’s own table for a named shape.

Accuracy, and where it comes from

Every build runs a baseline assertion check before the pages are generated and an output guard after it. Published reference values are checked to within 0.3 %, and all 305 tabulated size-and-schedule combinations are cross-checked against the industry chart formula with a maximum deviation of 0.1052 % — a difference that is entirely the density assumption, not a geometry error. The full statement, including the test results, is on methodology.

Dataset version 2026.09.1, dimensions last verified 2026-09-21. Corrections are issued with a version bump — see report a data error.

No warranty of any kind is given, express or implied, including fitness for a particular purpose. Values are provided as-is, and the reader remains responsible for verifying anything used in design, procurement or construction.

Licence

Computed values
The areas, masses, volumes and surface areas on this site are ours to publish and are free to use, including commercially, with attribution to https://stellasoradb.wiki appreciated. They are arithmetic, not a proprietary dataset.
Standards data
Pipe outside diameters and wall thicknesses belong to ASME, and material designations belong to the bodies that maintain UNS, EN, JIS and GB. If you intend to republish dimensional tables at scale, reproduce them from the standards themselves — which is also the only way to be sure you have the current edition.
Text
The explanatory text is ours. Quoting a paragraph with a link back is fine; wholesale reproduction is not.
Downloads
The CSV files at /downloads/ are generated from the same data and carry the same terms.

External links

Links to the standards bodies (1 of them) are provided so a reader can reach the authoritative source. We do not control those sites and are not responsible for their content, and their terms govern the material you obtain from them.

Reference data and tools

And the page that states the method behind all of it.