{"id":4561,"date":"2019-10-21T15:32:44","date_gmt":"2019-10-21T13:32:44","guid":{"rendered":"https:\/\/blog.febi.com\/?p=4561"},"modified":"2019-11-04T14:42:13","modified_gmt":"2019-11-04T12:42:13","slug":"tips-for-the-safe-tightening-of-wheel-bolts","status":"publish","type":"post","link":"https:\/\/blog.febi.com\/en\/tips-for-the-safe-tightening-of-wheel-bolts\/","title":{"rendered":"Tips for the Safe Tightening of Wheel Bolts"},"content":{"rendered":"\n

Although\nthe mounting of wheels onto a vehicle is generally self-explanatory, problems\noccur time and time and again in practice. The risks associated with an\nincorrectly tightened wheel are often underestimated. In order to avoid these\nrisks, some aspects should be considered.<\/p>\n\n\n\n

What is the Standard Tension Force?<\/strong><\/h2>\n\n\n\n

During\ndriving, the bolted connection of the wheel should absorb all dynamic loads, in\nparticular vibrations, so the wheel, brake disc, and hub all behave like a\nsingular part. To accomplish this, a standard tension force must be generated.\nThis is defined as the force required to tighten a bolt in the axial direction.<\/p>\n\n\n\n

The torque\nwhich is used to produce the standard tension force of the bolt during assembly\ngenerates a tensile strength in the thread. This leads to an elastic extension\nof the bolt and to a shortening of the wheel rim. Parameters, such as\ntightening torque, friction in the thread, material properties, and dimensions\nof the bolt and its strength class, influence the standard tension force.<\/p>\n\n\n\n

When the Standard Tension Force is Too Low <\/strong><\/h2>\n\n\n\n

If the\nwheel bolt is tightened with a lower torque than prescribed by the vehicle\nmanufacturer, the required standard tension force is not achieved. Under load,\nthis results in component vibration. The consequences can include the loosening\nof the bolt and, in the worst case scenario, the loss of the wheel.<\/p>\n\n\n\n

Even if a\nwheel bolt is tightened several times, its standard tension force changes. With\nrusty, dirty, or damaged wheel fastenings, the coefficient of friction\nincreases enormously so the standard tension force is greatly reduced.<\/p>\n\n\n\n

When the Standard Tension Force is Too High<\/strong><\/h2>\n\n\n\n

In the case\nof wheel fastenings being tightened without a torque wrench, it can be assumed\nthat the screw is tightened too tightly. This leads to the elongation of the\nwheel bolt or to the compression of aluminum rims in particular.<\/p>\n\n\n\n

In the case\nof retrofitted, lubricated wheel fastenings, friction is greatly reduced so the\nwheel fastening is over-stressed even when a torque wrench is used. In the\nworst case scenario, the bolt will break off.<\/p>\n\n\n\n

Instructions for Mounting Wheel Bolts<\/strong><\/h2>\n\n\n\n