Observed arrival · 2026-09-30
RefManual: engineering data with its standards attached
A searchable reference site for engineering tables, material data, thread dimensions, conversions, and calculators.
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- For
- Machinists, engineers, and fabrication learners
- Worth noticing
- The site says its search matches cross-standard equivalents: for example, 42CrMo4 points to the 4140 page.
Field notes
The site groups its material by workshop task, with sections for threads and fasteners, cutting tools, materials, tolerances, electrical reference, and conversions. Its search examples include cross-standard matching—42CrMo4 finds the 4140 page—and it says conversion factors are labeled exact or approximate. The homepage reports 2,966 data rows, while the listed calculators cover tasks such as tap-drill sizing and beam deflection.
Observed signals
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Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
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