The Importance of the Correct Bending Method and Choosing the Proper Mandrel Size for Rebar Bending
- NITIN GUPTA
- Mar 26, 2024
- 3 min read
Updated: Sep 24
Why Are TMT Bars Important in Construction?
TMT bars, or Thermo-Mechanically Treated bars, are the backbone of modern construction. Known for their high yield strength, ductility, and earthquake resistance, they ensure long-lasting durability of structures. The process of bending these bars must be done precisely to maintain their mechanical properties.

Why Is the Correct Bending Method Important?
Bending TMT bars requires utmost precision. If done improperly, it can lead to cracks, weakening the structure.
AMBA Shakti SD TMT Bars are produced using no twist straight mill rolling, ensuring no distortion and uniform bonding with cement.
CNC notching enhances uniformity, while controlled raw material ensures consistent performance.
Thus, correct bending helps retain the super ductility of the bars, essential for earthquake-resistant structures.
Why Is Choosing the Proper Mandrel Size Critical?
The mandrel size determines the inner diameter of the bend. Using the wrong size can damage the bar and compromise its load-bearing capacity.
For AMBA Shakti SD TMT Bars, the right mandrel size ensures smooth bending without cracks.
Their high-pass life HSS rolls and fully automated mill production deliver better finish, durability, and uniformity post-bending.
What Are the Features of AMBA Shakti SD TMT & AMBA Shakti Flexion TMT Bars?
Both AMBA Shakti SD and Flexion TMT Bars stand out due to their advanced manufacturing process and cost benefits:
Feature | AMBA Shakti SD TMT Bars | AMBA Shakti Flexion TMT Bars |
Technology | Thermax® Patented Technology | Thermax® Patented Technology |
Production | No twist rolling, CNC notching | Produced through LRF (Ladle Refining Furnace) |
Quality | High-pass life HSS rolls, uniform bonding | Refined steel, free from tramp elements |
Cost Benefits | ~20% cheaper vs. local quality steel | Competes with primary steel manufacturers |
Best Suited For | General construction, earthquake-resistant structures | High-rise buildings, dams, airports, megastructures |
What Makes AMBA Shakti Flexion TMT Bars Unique?
Produced via Ladle Refining Furnace (LRF) route, ensuring purer steel.
Removes tramp elements that compromise quality.
Suitable for complex and critical structures like dams, airports, and skyscrapers.
Offers cost savings due to efficient production processes.
Conclusion: Why Does the Right Bending Method and Mandrel Size Matter?
Choosing the correct bending method and mandrel size ensures TMT bars retain their strength, ductility, and flexibility. With AMBA Shakti SD TMT Bars and AMBA Shakti Flexion TMT Bars, builders get the best balance of quality, durability, and cost-effectiveness. For modern infrastructure, selecting the right material and method is not optional—it’s a necessity.
Ambashakti TMT Bars Across India – Trusted Quality & Reliable Supply
Ambashakti TMT Bars are used in national infrastructure projects as well as local construction across major Indian cities. From residential homes and high-rises to highways and commercial projects, builders and engineers rely on Ambashakti for IS 1786-compliant steel, consistent quality, and timely delivery.
Cities and Regions Where Ambashakti TMT Bars Are Available:
Delhi – Ambashakti TMT Bars in Delhi
Ghaziabad – Ambashakti TMT Bars in Ghaziabad
Noida – Ambashakti TMT Bars in Noida
Gurgaon – Ambashakti TMT Bars in Gurgaon
Faridabad – Ambashakti TMT Bars in Faridabad
Aligarh – Ambashakti TMT Bars in Aligarh
Rajasthan – Ambashakti TMT Bars in Rajasthan
Haryana – Ambashakti TMT Bars in Haryana
Uttar Pradesh – Ambashakti TMT Bars in Uttar Pradesh
Punjab – Ambashakti TMT Bars in Punjab
Madhya Pradesh – Ambashakti TMT Bars in Madhya Pradesh
Gwalior – Ambashakti TMT Bars in Gwalior
Etah – Ambashakti TMT Bars in Etah
Mainpuri – Ambashakti TMT Bars in Mainpuri
Shikohabad – Ambashakti TMT Bars in Shikohabad
Morena – Ambashakti TMT Bars in Morena
Datia – Ambashakti TMT Bars in Datia
FAQs
Q1. Why is mandrel size important in TMT bar bending?
The mandrel size defines the bending radius. Using the wrong size can cause cracks, weakening the bar and structure.
Q2. Which TMT bars are best for earthquake-resistant structures?
AMBA Shakti SD TMT Bars are highly ductile and retain strength post-bending, making them ideal for earthquake-resistant construction.
Q3. What makes AMBA Shakti Flexion TMT Bars suitable for megastructures?
Their LRF-based production ensures purer steel, free from impurities, making them perfect for dams, airports, and high-rise projects.
Q4. How are AMBA Shakti TMT Bars more cost-effective?
They use Thermax® Patented Technology and optimized production, offering up to 20% cost savings compared to local steel.



