In the paper, the results of statistical control of complex metal products have been presented. The statistical process control (SPC) is indicated as a solution developed to collect and analyse data, which allow to process performance monitoring. The process has been validated based on the evaluation of the process repeatability - repeatability in terms of meeting the criteria approving the product as compatible. As the basis for assessing the stability of the assembly processes the measurements of tensile strength (statistical tensile test) of metal hitch shaped by cold forming have been indicated. A set of the strength tests from 5 production days (in period 1 and 2) has been presented. The changes on histograms and frame-mustache charts have been highlighted as a first sign of deregulation of the forming machine - a threat to process stability in terms of efficiency and quality.Keywords: statistic control, SPC, control chart, assembly process, metal forming, tensile strength
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