What problems should be paid attention to when using a wrench during car maintenance


The Phillips wrench is a special tool for tightening or […]

The Phillips wrench is a special tool for tightening or flywheel wrench loosening screws. It has three series: standard type, positive and negative threaded type, and reducer type. There are fifty-two varieties, which can meet the horizontal, vertical and oblique directions in the building structure. For the requirements of connecting steel bars with the same diameter, different diameters, and adjustable length and direction, many car owners and friends need to use cross wrenches when disassembling tires or spark plugs.


Flywheel wrench rubber handle


When using a cross wrench, be sure to choose a cross that fits the nut or bolt completely. If you use a cross that is larger than the nut or bolt, the cross will easily round the head of the nut or bolt during the rotation. When disassembling relatively tight wheel bolts, if you put a suitable extension rod on the cross handle, the rotation torque can be increased, and it is easier to loosen the wheel bolts.It is important to note that if you use a cross wrench handle to extend the rod when tightening the wheel bolts, remember not to use too much force to prevent the rotation torque from exceeding the bearing range of the nut or bolt, otherwise the nut or bolt will be easily damaged.


Generally speaking, the specifications of cross wrenches in China are different from the general calculation methods abroad, and the product specifications are different. In China, cross wrenches are calculated according to the domestic calculation unit, which is called the metric system. The British calculation unit is the standard, which is called the British system. Because the metric system conversion has some omission mantissas, there are some differences in the size of the product specifications, but in general it is still common.


According to the different conversion units at home and abroad, it is also different from the machines manufactured, so the required cross wrenches are also somewhat different, but generally cross wrenches are used for car repair and machine repair, so in You only need to buy metric products in China to use it, except for some new equipment imported from abroad.How 1 inch  is calculated in general calculations, but some cross wrench manufacturers directly convert it to 1 inch = 2.5cm, so the products in the industry are not very accurate, but for large manufacturers All calculations are based on the previous one. This is also the most basic national standard. The above is the basic national standard of cross wrench specifications.