The Role of Tolerances in Design and How They Affect Cost Metal fabrication tolerance is a matter of balance. When tolerances are excessively tight, production may slow down and result in more lost materials. Furthermore, it may require advanced machining practices and more steps, which results in higher costs. And when tolerances are too lenient, bad fit, assembly problems, and performance failures may set occur. https://seabornmfg.com/the-role-of-tolerances-in-design-and-how-they-affect-cost/