Advisor / ISO GPS reference
Drawing symbols · surface texture
What the symbol on the drawing means, and what it asks of the machine
Geometric tolerance symbols and roughness parameters in plain language, each with one short note on how it shows up in machining. Written in our own words; the standard and the drawing stay the authority.
Form tolerances
Circularity · Cylindricity · Flatness · Straightness
Profile tolerances
Profile of a line · Profile of a surface
Orientation tolerances
Angularity · Parallelism · Perpendicularity
Location tolerances
Coaxiality · Concentricity · Position · Symmetry
Run-out tolerances
Circular run-out · Total run-out
Surface roughness parameters
Standards
Related: Surface finish guide, ISO insert code decoder.