The main difference between Fe 500 TMT Grade Bar and Fe 550D TMT Grade Bar is the strength of the material. The Fe 500 TMT Grade Bar is designed to withstand a minimum strength of 500 MPa. While the Fe 550D TMT Grade Bar is designed to withstand a minimum strength of 550 MPa.
While both classes give the most typical benefits to any building project, it may be difficult for anybody to pick the optimal one for their construction process. However, demand for Fe 550 D grade TMT bar is higher than for Fe 500D due to their higher yield strength and elongation %.