How tight is the screw for the car tires?
The compressed air pressure of 4 ATM, the use of wind gun when the torque value tighten around 40-50N.m, you'd better choose a bolt or nut, use your common air gun made in the use of the boosting rod tighten with the normal force, to check how much torque, so there is a number in the heart. By the way, your boss say a bolt or nut screwed on the ground is not too tight, any thread needs a proper preload, ensure the thread can lock the screw thread but not too loose, easy to cause the thread off, easily lead to tooth fracture or too tight. The car wheel fixing screw torque should be much, car maintenance manual should be clearly defined, I haven't checked, can not talk, suggest you check the vehicle maintenance manual, with practice, must be able to grasp. In addition, the order of the wheel screws should be played diagonally, not one by one in sequence.
A bolt or nut to play tight, in the automobile factory are clearly defined, control device factory with professional torque (torque torque, air gun, display setting or digital type torque wrench to ensure torque etc.). Different specifications and grades of bolts and nuts have specified torque range values. Here, give you a general reference range (the unit is N.m, referring to level 8.8): M8:20-30; M10:27-43M; M12:40-60; M14:60-80. Use air gun made after the torque value due to wind gun type and compressed air pressure of different sizes will be very different.
Different specifications and grades of bolts and nuts have specified torque range values. According to the level of the bolt can be made.Tip: now the car four tire screws are all normal right-hand, that is clockwise tightening. The left side of the truck is left and right.
