Precision in industrial tightening is one of the main factors in choosing a quality screwdriver.
The reason is simple: the quality and precision of tightening directly determine the quality of the finished product.
In many sectors, in fact, the quality of tightening is not only a technical requirement, but a critical element for:
- maintaining consistent performance over time,
- avoiding accidental loosening due to vibrations,
- preventing breakage of components or screws themselves caused by excessive tightening,
- ensuring the tightness of sensitive parts (such as medical devices that may contain fluids).
It is therefore clear that an assembly that is not performed correctly can compromise the entire functionality of the product.
For this reason, the industrial sector relies on international standards that allow the reliability of screwdrivers to be verified objectively. Among these, the main reference is ISO 5393, which defines both the test procedures for screwdrivers and the criteria for evaluating the stability and repeatability of the tool’s torque. This standard represents the shared starting point for understanding whether a screwdriver is truly capable of guaranteeing repeatability of tightening over time.
And it is precisely on the basis of ISO 5393 that the indicators that best describe the actual capacity of a screwdriver come into play: Cm (Machine Capability) and CmK (Machine Capability Index). ISO determines how the tests must be carried out; Cm and CmK are the values derived from those tests and indicate, in a very simple and clear way, how stable and centered a screwdriver is with respect to the required torque value.
In practice: ISO defines the method, while Cm and CmK describe the test result. In the most demanding contexts of industrial tightening, values equal to or greater than 1.67 are considered excellent, synonymous with a controlled, repeatable, and reliable process.
Understanding these aspects is also essential for distinguishing between the different types of assemblies encountered in industry, each with different critical issues and requirements.
These range from safety assemblies, where failure can cause damage to property or people, to assemblies subject to quality but not to safety requirements and where no specific certifications are required, to the simplest assemblies, where no particular requirements or checks are required.
In safety assemblies, it is essential to use tools equipped with built-in transducer, which allow the torque to be measured directly during tightening, certify the operation, track the values applied and constantly check the quality of the tightening.
At this point, it is clear that precision, regulatory standards, metrological indicators, and types of application are closely interrelated: the choice of screwdriver depends on the level of risk involved in the assembly and the need to ensure a stable, repeatable, and documentable process.
It is precisely in this technical and operational context that the new eTensil range with built-in transducer fits in, developed by Fiam to meet the real needs of tightening professionals.
eTensil screwdrivers with built-in transducers offer performance that complies with precision assembly standards, ensuring:
- Cm and CmK ≥ 1.67 with a tolerance of ±5%,
- advanced strategies, multiple programming, Poka Yoke management, and complete parameter traceability, thanks to the combined TPU-A3 power supply and control unit.
These features also make eTensil with transducer suitable for safety assemblies, ensuring constant certifiability, total process control, and full compliance with industry standards.
In other words, this level of precision allows you to work in line with international standards and the requirements of sectors that demand the highest quality.
If you would like to learn more about these topics or try out the new screwdrivers with built transducers, we are available to provide you with more information or arrange a free demo directly at your production site.pics or try out the new screwdrivers with integrated transducers, we are available to provide you with more information or arrange a free demo directly at your production site.