Many customers mistakenly believe their minimum bend radius should equal their material thickness (e.g., if the material is 0.125” thick, the smallest possible bend radius is 0.125”). These factors help you determine the minimum bend radius. To avoid damaging a part during forming, you must take into account its shape and dimensions, as well as the hardness and thickness of the metal you are using. Sheet metal forming can be a precarious process. 5: How Do I Find the Minimum Bend Radius?