Incorrectly tightened bolts can lead to overloaded assemblies or leaks in flange joints and cause significant costs. To ensure that a bolted joint in, for example, chemical plants, wind turbines, industrial plants, etc. achieves or maintains the required bolt force, there is for the first time an easy-to-use and economically viable solution that differs only slightly from a normal washer. Instead of guessing, the knowledge of the bolt force reduces the cost of unnecessary checks, retightening processes, and maintenance. The sensor washer and the intelligent evaluation and documentation of the bolting process give you unprecedented protection against the failure of a bolted joint. Additional data enables complete documentation and innovative insights into error prevention.