What are car bolts?
Auto bolt is a kind of high-strength bolt used to connect auto parts, usually used to fix the wheel, engine, transmission, chassis system and other key parts. These bolts have different grades and specifications to meet the connection needs of different parts of the car.
hub bolt is a high strength bolt that connects the wheel of the vehicle to the hub unit bearing of the wheel. The class of hub bolts varies according to the type of vehicle, for example, subcompact cars usually use class 10.9 bolts, while medium and large vehicles use class 12.9 bolts. The structure of the hub bolt generally includes a knurled gear and a threaded gear, and a cap head. Most of the T-head hub bolts are above 8.8 grade, which bear the large torque connection between the automobile hub and the axle; Most of the double-headed hub bolts are above grade 4.8, which bear the connection between the lighter torque of the car's outer hub shell and the tire.
The application of automotive bolts is not only limited to wheel connection, but also includes the link and fastening of the engine, transmission, chassis system, oil road water, new energy vehicle battery pack, motor and other parts. The performance grade and material of these bolts are specially treated to ensure stable connection performance under high strength and load conditions.
To sum up, automotive bolts are indispensable fasteners in automobile manufacturing, and the choice of design and material is directly related to the safety and durability of automobiles.
The importance of automobile bolt tightening torque standard
The standard of automobile bolt tightening torque is an important link to ensure the safe operation of automobile. The correct tightening torque can ensure that bolts do not loosen during operation, thereby avoiding safety hazards caused by loosening. Incorrect tightening torque may cause the bolt to loosen, which may cause mechanical failure, and may even cause serious safety accidents.
Standard tightening torques of bolts at different parts
Support and body bolts : specifications are 13 mm and tightening torque is 25N.m.
bolts for support and main body : specifications are 18 mm, tightening torque is 40N.m, need to be turned 90 degrees, with 50N.m torque.
bolts for the support and engine support : specifications are 18 mm and tightening torque is 100N.m.
engine spark plug : for 1.6/2.0 displacement engine, tightening torque is 25N.m; For a 1.8T displacement engine, the tightening torque is 30N.m.
oil drain bolt : the tightening torque is 30N.m.
oil filter : tightening torque is 25N.m.
crankshaft timing wheel bolt : tighten the bolt to a torque of 90N.m and turn it 90 degrees.
control arm and subframe : tightening torque is 70N.m+90 degrees; The tightening torque between the control arm and the body is 100N.m+90 degrees.
connection bolts for front shock absorber and steering knuckle : tightening torque is 65N.m+90 degrees /75N.m.
rear axle head self-locking nut : the tightening torque is 175N.m.
The rear axle support is connected to the rear axle : the tightening torque is 80N.m.
The rear shock absorber is connected to the body : the tightening torque is 75N.m.
tire bolt : tightening torque is 120N.m.
Precautions
Use the right tools: Make sure to tighten with the right tools to avoid using too much force to cause bolt damage.
Regular inspection: Check the tightening of bolts regularly to ensure that they are not loose.
Follow manufacturer's recommendations: Follow the recommendations in the maintenance manual provided by the vehicle manufacturer to ensure that the correct tightening torque is used.
By following these standards and precautions, you can ensure the safety and reliability of your car.
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