Tolerance analysis of assemblies promotes concurrent engineering by bringing engineering requirements and manufacturing capabilities together in a common model. This analysis can be used for optimization of assembly performance before manufacturing. It can provide a quantitative design tool for predicting the effects of manufacturing variations on the performance and cost in a feature based CAD environment. Seat belt fastener is a kinematic assembly which is analyzed in this paper. Among methods of tolerance analysis Direct Linearization Method (DLM) is selected and perform step by step on this assembly. Sensitive dimensional and geometrical tolerances are determined. In addition the percent of rejected assembly are calculated and what-if studies performed to assign tolerances

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