EngiRef / About
About EngiRef
A desk reference for engineering students and working engineers: formulas with their variables explained, common material properties, physical constants, unit conversions and metric bolt data, 468 entries in all, with 14 guides on using them.
One dataset
The formulas, material properties, constants and conversion factors live in a single generated dataset compiled for this site, and every page reads from it, so a conversion page and a reference table cannot disagree. The dataset does not cite a source for each value. EngiRef is not affiliated with ASME, ASTM, ISO, the NFPA or any other standards organisation and reproduces no standards text; where a guide mentions a designation such as a bolt property class, the standard or the product data sheet you are working to is the authority on the figure.
Those entries are grouped into 10 collections, each browsable page by page. The printable charts are laid out from the same records, and where the data holds no figure, such as a yield strength missing for some materials, the cell reads “not defined” with a footnote rather than showing a dash that could pass for zero.
Who runs it
EngiRef is written and maintained by one independent developer; no standards body, professional institution or manufacturer stands behind it. PhysRef, CalcRef, DatumLab and PressBench are among the other one-subject references that developer keeps.
EngiRef's guides have no individual byline. They appear under the site's name, and the structured data lists the site's organization as their author. No P.E., C.Eng or degree is claimed, which matters on a site that talks about safety factors and bolt grades. The date on a guide is the day its text was most recently edited, not the day it first went up.
What it must not be used for
EngiRef is a reference and learning tool, not a design authority. It carries none of the exceptions and conditions a standard attaches to its tables, and it knows nothing about your application, your loads, your material certificate or your jurisdiction. Anything that could hurt someone or fail in service has to be designed and signed off by a qualified engineer working from the governing standard.
Corrections
Found a wrong value? Tell [email protected] which page it is on and what you expected it to be; a correction lands in the dataset itself, so every page drawing on that value is fixed in one move.