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TMT Bars. Engineered with German Thermex Technology.

Fe 500. Fe 500D. Fe 550D. BIS-certified. CII Green Pro. 9,500 tonnes per month, ready to dispatch in 24 hours

What Are TMT Bars ?

TMT (Thermo-Mechanically Treated) bars are high-strength reinforcement steel bars used in concrete structures. They get their name from a special manufacturing process in which the hot rolled bar passes through a water-cooled quenching box immediately after rolling – which gives the bar a tough, hardened outer rim and a softer, more ductile inner core.

The result is a reinforcement bar that combines two properties that are normally in tension with each other: high strength on the outside (so it resists tensile load), and high ductility on the inside (so it can bend, flex and absorb earthquake energy without cracking).

Apple Industries Limited TMT Bar Grade Range

GradeYield StrengthStandardBest For
Fe 500500 MPa minIS 1786:2008Residential & commercial construction
Fe 500D500 MPa minIS 1786 (D = Ductile grade)Earthquake-prone zones, premium construction
Fe 550D550 MPa minIS 1608, IS 1786 & IS 1599High-rise construction, infrastructure, bridges, PSU tenders
German H&K Thermex Technology

The quenching technology used to produce TMT bars determines the bar’s performance – which is why Apple Industries Limited  chose the German H&K Thermex Quenching Box line.

Thermex is the original tempcore-style quenching technology, and the H&K Thermex Box is one of the most precision-engineered implementations available. It produces TMT bars with:

  • A finely tempered martensitic rim - giving high yield strength
  • A tempered ferrite-pearlite core - giving high ductility and bendability
  • A consistent rib pattern - giving superior concrete bond strength
  • Excellent corrosion resistance - relative to standard cold-twisted bars

Every Apple Industries Limited TMT bar – Fe 500, Fe 500D and Fe 550D – is produced on this line. The quality is not a function of which batch you order. It is a function of how the plant is built.

8 Standard Diameters

Sizes Apple Industries Limited Manufactures

Apple Industries Limited  produces TMT bars in 8 standard diameters – from 8 mm to 32 mm.

Available Diameters

TMT Bar Sizes We Manufacture

8 mm
10 mm
12 mm
16 mm
20 mm
25 mm
32 mm

Special sizes can be discussed for bulk orders. Standard lengths and tolerances comply with IS 1786.

8 Standard Diameters

Where Apple Industries TMT Bars Get Used

Building Construction

Foundations, columns, beams and slabs for residential and commercial buildings. Recommended: Fe 500, Fe 500D

Infrastructure

Dams, flyovers, highways, tunnels and metro projects. Recommended: Fe 550D

Who We Supply?

Apple Industries Limited TMT bars reach the project site through three buyer channels:

  • Builders and developers - for residential and commercial projects
  • Infrastructure and government project contractors - including EPC firms working on highways, bridges, water structures, and PSU tenders
  • Architects, structural engineers and main contractors - who specify Apple Industries Limited by grade and BIS licence

Procurement options:

  • Direct purchase from the mill - for large bulk orders, EPC contractors and project sites with 50+ tonne requirements
  • Through our authorised dealer & distributor channel - for smaller orders, retail purchase and project sites that prefer local invoicing
FREQUENTLY ASKED QUESTIONS

What is the difference between Fe 500 and Fe 500D TMT bars?

Both grades have a minimum yield strength of 500 MPa. The ‘D’ in Fe 500D stands for ‘Ductile’ – meaning the bar has tighter elongation and bendability specifications. Fe 500D is specifically engineered for earthquake-prone zones and premium construction where a small additional safety margin matters. Both grades are produced by Apple Industries Limited under BIS Licence CM/L-6600091814.

Fe 550D is a higher-strength TMT grade with a minimum yield strength of 550 MPa – 10% higher than Fe 500. Combined with the ductile (D) specification, it is the preferred grade for high-rise construction, large infrastructure projects, PSU tenders, and any project where reducing rebar weight per tonne of construction matters. Apple Industries Fe 550 and Fe 550D are third-party certified per IS 1608 (Part 1), IS 1786 and IS 1599 by V2 Civil Diagnostic Pvt Ltd.

For most residential construction in India, Fe 500 or Fe 500D TMT bars are the right specification. They offer the correct balance of strength, ductility, weldability and cost – and meet all relevant Indian building code requirements. Use Fe 500D specifically if the project is in an earthquake-prone zone. Apple Industries produces both grades to BIS standards.

The minimum order quantity is 25 tonnes. Standard lead time from order confirmation to dispatch is 24 hours. Transport arrangement can be coordinated based on customer requirement.

Yes. Apple Industries holds CII Green Pro certifications across our complete TMT grade range – Fe 500, Fe 500D, 

. This certification counts toward LEED, GRIHA and IGBC ratings on green-rated construction projects.

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    Integrated steel manufacturer in South India. Sponge iron, MS billets and German-Thermex TMT bars from our 82.96-acre Anantapur plant since 2010.

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