| Feature | ANSI (US/Canada) | ISO (Global) | | :--- | :--- | :--- | | | Third-angle (US standard) | First-angle (global standard) | | Dimension Text | Aligned with dimension line (horizontal above leader) | Always horizontal (on leader line) | | Arrowhead Style | Filled, solid | Filled, solid (but often smaller) | | Decimal Separator | Period (e.g., 1.50) | Comma (e.g., 1,50) | | Unit System | Inches (IPS) or mm (MMGS) | Millimeters (MMGS) default | | Leader Style | Straight lines with 90° elbows | Curved leaders or 60°/120° elbows | | Section/Detail View Labels | SECTION A-A, DETAIL B | A-A, B (simpler labeling) |
Why it matters: Mixing these up can cause manufacturing errors. A part drawn in first-angle but interpreted as third-angle will be mirrored. iso vs ansi solidworks
"In the ISO corner," Silas narrated, pointing to the title block, "We have the First Angle Projection. This is the European way. You look at the object from the right, and you draw it on the left. It’s logical. It’s compact." | Feature | ANSI (US/Canada) | ISO (Global)
He pointed to a specific dimension: Ø 25,4 mm . This is the European way