Leg Length:
US: Up to 6×6 in (152mm) for heavy loads; China: Up to 200×200mm for infrastructure.
Europe: L120×120×10 for industrial use; Japan: L75×75×6 for residential.
Thickness:
China: 3–20mm (equal-leg), 4–16mm (unequal-leg).
US: 0.125–1 in (3–25mm), thicker for bridges.
Tolerances:
Japanese standards enforce ±0.3mm; Chinese GB allows ±0.5mm for mass production.