Nov. 18, 2020
We can always see both arms tighten the tire wrench with full strength, and if the arm strength is not enough, we still use our feet to step on it. Although it can be tightened very tightly and will not loosen, it will cause cracks in the inside of the screw due to excessive force. Time usage may cause the screw to break.
Many car owners know how to replace the spare tire, but there is also a problem that most people ignore, that is the torque of the tire screws.
The torque of tire screws is a very unfamiliar concept to many car owners, but in fact, this concept is very important.
Generally speaking, every screw has a certain torque requirement, especially for bolts used to carry huge weight, there will be strict corresponding torque requirements, and tire screws are among them.
However, we can always see non-standard actions of tightening the tire screws-tightening the tire wrench with both arms, and many people step on it with their feet for fear of insufficient arm strength.
It is true that the screw can be tightened very tightly without loosening, but it is often caused by excessive force, which exceeds the design stress of the screw, and the internal cracks caused by the elongated thread and the excessive force on the thread will appear for a long time. Use or sudden violent force may cause the screw to break.
Hidden dangers of car Wheel screws: The first problem is that the wheels may be thrown out due to the sudden disconnection of the screws. The more high-speed driving and violent bumps, the greater the pressure on the tire screws, and its own "health" becomes extremely important.
There have been many painful cases caused by substandard wheel screws. Therefore, the quality of a small tire screw is of great importance.
Different models of different brands require different torques for tires and wheel bolts, and the specific torques are generally indicated in the vehicle's user manual.
According to the experience that Dachehui has mastered for many years, the torque of the tire screw of the general passenger car is mostly 120~180Nm. When using a torque wrench to tighten the screw, the torque value is preset, and when the torque is reached, the force will be automatically released. , And issued a "click" sound prompt.
At the same time, it is very important that tire screws have requirements for manufacturing strength and material hardness. The general strength value of the quality standard wheel hub screws is above 10.9. That is to say, the tire screws are not capable of anyone screw. Don't change them at will because of the fancy appearance and novel style. This is the same as those that only have the appearance and no quality. The hidden dangers of the low-quality wheels are the same.
For car owners who have the ability to change tires by themselves, license plate frame manufacturers have a piece of small advice, that is, when screwing, in order to make the wheel hub and all screws evenly stressed, follow the diagonal order Let's tighten the screws.