Accurate dimensions, sectional weight formulas, and bundle configurations for all primary SAIL TMT bar diameters ranging from 8mm to 32mm.
Calculate exact total weight from total length or vice versa using standard steel density formula ($D^2 / 162.2$).
Complete dimensional breakdown complying with Bureau of Indian Standards tolerances.
| Nominal Size (mm) | Cross Sectional Area (mm²) | Weight per Meter (kg/m) | Weight per 12m Rod (kg) | Standard Bundle Pieces | Application Overview |
|---|---|---|---|---|---|
| 8 mm | 50.27 | 0.395 kg | 4.74 kg | 10 Pcs | Stirrups, rings, tie beams, and secondary slab reinforcement. |
| 10 mm | 78.54 | 0.617 kg | 7.40 kg | 7 Pcs | Roof slab bottom/top mesh reinforcement and staircase slabs. |
| 12 mm | 113.10 | 0.888 kg | 10.66 kg | 5 Pcs | Main beams, lintels, columns for independent residential villas. |
| 16 mm | 201.06 | 1.578 kg | 18.94 kg | 3 Pcs | Heavy columns, multi-storey commercial frames, and retaining walls. |
| 20 mm | 314.16 | 2.466 kg | 29.59 kg | 2 Pcs | High-load columns, industrial foundations, and bridge piers. |
| 25 mm & 32 mm | 490.87+ | 3.855 kg - 6.313 kg | 46.26 kg+ | Single / Custom | Heavy infrastructure, large dams, skyscrapers, and heavy civil engineering. |
The universal formula used by site engineers and quality inspectors to verify steel weight on-site.
Weight per meter (kg/m) = $D^2 \div 162.2$, where 'D' is the nominal diameter of the steel bar in millimeters. This formula is derived directly from steel density ($7.85 \text{ g/cm}^3$).
Standard manufacturing length for transportable TMT steel bars in India is 12 meters (approx 39.4 feet). Total rod weight is calculated by multiplying weight per meter by 12.
BIS allows minor mass variations (tolerances) on nominal weight. However, primary SAIL TMT bars maintain tight dimensional precision well within permissible limits.
Checking weight per meter prevents fraud and ensures structural load-bearing capacity matches your architectural design calculations.
Every SAIL TMT bar is manufactured with precision rib geometry ensuring maximum concrete bonding strength.
Optimized surface ribs ensure unmatched bonding grip with cement concrete structures.
Advanced mill rolling ensures uniform cross-sectional diameter from end to end.
Every dispatch batch includes official test certificates verifying exact weight and tensile strength.
Virgin iron ore composition minimizes impurities, protecting against rust and degradation.
Clear answers regarding steel bar weight formulas, standard lengths, and allowable tolerances.
The standard weight of a 12mm TMT bar is 0.888 kg per meter. For a standard 12-meter length rod, the total weight is approximately 10.66 kg.
The formula $D^2 / 162.2$ is derived from the volume of a cylinder using the standard density of steel ($7.85 \text{ g/cm}^3$), converting millimeters and meters into kilograms.
Standard transport length for TMT rebars is 12 meters (approx 39.4 feet), designed to fit standard truck bed lengths safely.