What Tolerances Should I Specify, and How Do Tighter Tolerances Change the Cost?

Sheet metal tolerances and cost move together. Specify tolerances only where the part function needs them. Laser cutting typically holds around ±0.1 mm on standard sheet thicknesses. Stamped and bent dimensions depend on material and tooling. General tolerances cover most features. Tighter callouts add cost because they slow production and add inspection.

Match each tolerance to its function. A mounting hole may need tight control. An outer edge may not. Ask your engineer which dimensions really matter. The drawing should carry a clear general tolerance block plus critical callouts. Xinjiuxinji confirms achievable tolerances for your specific features in a free DFM review before quoting. We then verify them through first-article inspection. Send your drawing to tylor@xinjiuxinji.com.