In which document must the tightening torque of a bolt or stud connection be included?

The tightening torque of a bolt or stud connection must be included in the installation instructions because these instructions serve as the detailed guideline for how to properly install components. It is crucial for the integrity and safety of mechanical assemblies that bolts and studs are tightened to the specified torque levels; failing to do so can lead to mechanical failure, leaks, or other critical issues. Installation instructions provide the necessary specifications to ensure that components are assembled correctly and that the installation process adheres to the manufacturer's recommendations.

The other documents may contain relevant information, but they do not typically focus on the specific procedures and specifications needed during the installation phase. For instance, a maintenance manual primarily includes information about maintenance procedures and schedules, while an engineering report may discuss design criteria and testing results rather than installation specifics. A safety data sheet is focused on chemical safety and handling rather than mechanical assembly instructions.