These are separate sites, each one a reference for a different trade. They work the same way ThreadRef does: the data is served to your browser, there is no account, and the free part stays free. Each description is the site's own.
- AmpSizerWire size, ampacity, voltage drop and conduit fill calculators built on published tables, from 14 AWG to 2000 kcmil in copper or aluminum.
- SpanRefPublished lumber span tables for floor joists, ceiling joists, rafters and decks, with instant span lookup, a deck calculator and reverse sizing.
- MixRatioConcrete, mortar and grout calculators for slabs, footings, columns and post holes: cubic yards, cubic metres and bag counts, plus worked examples.
- GaugePassWeld symbol, filler metal, discontinuity and welding math reference, plus practice questions and an interactive gauge trainer for welding inspectors.
- FittingKeyHydraulic and pneumatic fitting identifier: match thread diameter, threads per inch and seat across the sizes and standards in common use.
- SidewallRefTire size decoder and comparison reference: break a size like 225/65R17 into its parts, read the diameter and sidewall height it implies, and compare two sizes for speedometer error.
- CoatSpecCoating inspection calculations and field logging: dew point, SSPC-PA 2 style DFT acceptance, WFT targets, coverage, and a printable daily report.
- ReadTheSetLearn to read construction drawings by reading a real set: floor plans, sections, details and schedules, with measuring and callout drills.
Looking for something on this site instead? The size reference, the thread identifier and the guides are the places most visitors start.