The Indostar Fe 550D TMT Bar - 16 mm by Indostar is a 16 mm TMT high-strength deformed reinforcement bar in Fe 550D grade, manufactured to IS 1786:2008 (High Strength Deformed Steel Bars and Wires for Concrete Reinforcement). Conforming to the enhanced ductility requirements of the IS 1786 D-designation, this bar delivers a minimum yield of 550 MPa, tensile of 600 MPa, and critically, a minimum elongation of 14.5% with a UTS/YS ratio ≥ 1.08 — exceptional high yield strength combined with superior ductility — the dual advantage of the D-grade designation. The 16 mm bar in 12 m standard lengths is a preferred choice for slab primary bars, beam reinforcement, column verticals, and general structural RCC, where high strength and seismic ductility must coexist for safe structural behaviour under dynamic loading.

• Fe 550D IS 1786:2008 TMT bar: the ductility-enhanced high-strength grade for critical structures
• Minimum yield 550 MPa | Minimum tensile 600 MPa | Minimum elongation 14.5%
• Standard 16 mm bar in 12 m lengths: correct cross-sectional area for IS 1786 structural design tables
• TMT process superior to cold-worked bars: no locked-in residual stress, better long-term fatigue life
• UTS/YS ratio 1.08: required by IS 13920 for ductile detailing in seismic RCC frames
• Ribbed surface profile: mechanical interlock with concrete — proven no-slip under cyclic seismic loads
• Excellent weldability: low carbon equivalent allows direct site welding without special preheat procedures
• Good corrosion resistance relative to plain carbon steel — extended service life in reinforced concrete
• Consistent weight per metre enabling accurate procurement and minimising site rebar wastage
• IS-marked and heat-traceable for regulatory compliance from mill test to final structural inspection

• Primary reinforcement in school, hospital, and disaster-resistant public buildings
• Cold-storage and refrigerated warehouse floor slabs and structural frame reinforcement
• Wind turbine tower foundations, solar farm ground anchors, and renewable energy civil works
• Water treatment plants, sewage treatment works, and liquid retaining structures
• Precast railway sleepers, electric pole foundations, and infrastructure precast products
• Mining and processing plant concrete structures, crusher foundations, and mill bases
• Airport runway sub-bases, terminal building structures, and airside infrastructure concrete