More tools

These are separate sites, each a reference for a different trade. Each description is the site's own.

• GaugePassFree weld symbol, filler metal, discontinuity and welding math reference, plus practice questions and a gauge trainer for welding inspectors.
• ThreadRefThread and fastener reference for 228+ sizes: metric, Unified and pipe threads with tap drills, clearance holes, torque estimates and wrench sizes.
• FittingKeyHydraulic and pneumatic fitting identifier: match thread diameter, threads per inch and seat across 110 sizes and 10 standards.
• AmpSizerWire size, ampacity, voltage drop and conduit fill calculators built on published 2023 NEC tables, from 14 AWG to 2000 kcmil in copper or aluminum.
• EngiRef119 engineering formulas with solvers, 56 materials, 134 unit conversions, constants and reference tables.

Looking for something on this site instead? The coating calculator, the guides and the reference are the places most visitors start.