Mild Steel Coupler Manufacturer Coupler Type - Rebar Coupler Size - 50 mm Material Grade - MS Thread Type - Metric Thread Usage - Construction, Rebar Joint Surface Finish - Black Tensile Strength - 600 MPa Standard - IS 16172 Coating - Hot Dip Galv A Mild Steel Coupler is a mechanical component used to join reinforcing bars (rebars) in reinforced concrete structures. These couplers are commonly made from mild steel due to its favorable properties such as high ductility, malleability, and ease of manufacturing.