JIS G3192 specifies H-beam dimensions for structural use, categorized into S, M, and L series based on flange width relative to height:
- S-series: Small flanges (flange width < 0.8x height). Examples: H-100×50S (height 100mm, flange width 50mm, web thickness 5mm, flange thickness 8mm).
- M-series: Medium flanges (0.8x height ≤ flange width < 1.2x height). Examples: H-200×200M (200x200x9x14mm).
- L-series: Large flanges (flange width ≥ 1.2x height), used for heavy loads. Examples: H-300×300L (300x300x10x15mm).
JIS H-beams range in height from 100mm to 1000mm, with length typically 6–12m. Dimensions are precise, with strict tolerances for web and flange thickness to ensure consistency in structural performance. The JIS system also includes HP-series (H-piles) for foundation applications, with thicker webs for load-bearing in soil.