High Strength Deformed Bars & Wires for Concrete Reinforcement

Specifies requirements for cold-twisted deformed bars (CTD) and thermo-mechanically treated (TMT) bars used as reinforcement in RCC structures.

Key clauses — Rebota's plain-English summary

Paraphrased for working engineers, not a verbatim reproduction of the standard. For compliance documentation, tender submissions, or any use requiring the exact clause text, refer to the official IS 1786:2008 document published by the Bureau of Indian Standards (BIS) — this summary is an interpretation aid, not a substitute for it.

• Grades: Fe415, Fe415D, Fe500, Fe500D, Fe550, Fe550D, Fe600
• D suffix (ductile): minimum elongation 18% vs 14.5% for standard grade
• Unit weight formula: W = d² ÷ 162.28 (kg/m for diameter d in mm)
• Yield strength (Fe500): minimum 500 N/mm² at 0.2% proof stress
• Elongation: minimum 14.5% for Fe500 on gauge length = 5.65√A