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Gravity makes things fall down and is the reason the aerospace industry exists. In the world of manufacturing, entropy is the reason why your equipment, specifically your torque control tools, slip out of alignment and require recalibration. Simply put, the more you use a torque wrench, the more likely it is to need calibration. Calibration is the process of ensuring that the workings of your instrument correspond to their posted standards. Considering the purpose of torque tools is to deliver a precise amount of radial force to a fastener such as a bolt or screw, if they are out of calibration, they will not be able to perform their function.
If a torque tool registers that it has delivered more torque than it actually has, the fastener may become over-tightened, causing it to deform or break when your product is in use.
On the other hand, if your torque tool registers that it has delivered less torque than it actually has, your fastener may not be tight enough. As a result, it could back off and come loose while your product is in operation. There are only two steps involved, in fact: test the calibration of your wrenches and recalibrate wrenches which have fallen out of alignment.
The current international standards governing the calibration of torque wrenches are the ISO and The two standards are published by the same body, the International Standards Organization, and they are interlinked.
While the first part is concerned with design and quality conformance testing and the second focuses on measurement uncertainty and calibration requirements, essentially, they are two parts of the same whole. According to these guidelines, torque tools should be tested for calibration once every 5, cycles or six months, whichever comes first. If any tool is found to be out of calibration, it must be recalibrated, retested, and recertified. To ensure it does not slip out of calibration again without being noticed, the calibration interval for that particular tool is then halved to 2, cycles or three months.
Testing your torque tools can be accomplished by a variety of means. The simplest is to send them to a certified laboratory. This is separate from the ISO, which is an international body and limits its responsibility to the publication of standards, not their verification or enforcement.
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