What is the Screw Torque Standard?

1 Answers
EdenRose
07/29/25 5:31pm
Screw torque standards are as follows: 1. Class A: Fixing of iron screws and iron nuts, such as: assembly of various components of the box body. Fixing of grounding screws and nuts. PCB fixed to the box body. 2. Class B: Iron screws and copper nuts (screw holes and screw holes of aluminum alloy materials), such as: fixing of transistors or wire terminals to aluminum heat sinks. Aluminum heat sinks fixed to the PCB. Fixing screws for large capacitors or transistor terminals (TERMINAL). Fixing of RS-232 hexagonal copper pillars. 3. Class C: Iron screws (self-tapping) locked into plastic holes. Such as: plastic panel fixed to the box body. PCB fixed to the plastic panel. 4. Class D: Iron screws (self-tapping) locked into drawn holes with a plate thickness of 1.0. M3 drawn holes are ф2.8(+0, -0.05), and M4 drawn holes are ф3.65(+0.05, -0). 5. Class E: Iron screws (self-tapping) locked into drawn holes with a plate thickness of 1.2, with the same dimensions as Class D.
Was this review help?
10
1
Share
More Forum Discussions

What does 240 at the back of a CRV mean?

240 at the back of a CRV refers to the turbocharged engine model, which can reflect the vehicle type. The CRV is a specific type of vehicle. Below is detailed information about vehicle types: 1. Overview: Vehicle type refers to a specific form of vehicle, distinguished by common characteristics, intended use, and functionality. Examples include sedans, trucks, buses, trailers, and incomplete vehicles, each being a separate type. 2. Others: Heavy-duty vehicles have a length of 6m or more and a total mass of 12,000kg or more. Medium-duty vehicles have a length of 6m or more and a total mass between 4,500kg and 12,000kg. Light-duty vehicles have a length of less than 6m and a total mass of less than 4,500kg. Mini vehicles have a length of 3.5m or less and a load capacity of 1,800kg or less.
16
3
Share

Why Do Water Droplets Not Fall Off After Car Waxing?

It is a normal phenomenon for water droplets to not flow off the car after waxing. Here is the relevant explanation as to why water droplets do not fall off after car waxing: 1. Increased water droplets: This is likely due to the quality of the car wax. There are many inferior car waxes circulating in the market, which often do not have good hydrophobic properties and may even perform worse than the original factory paint, resulting in water droplets. 2. Do not wash the car immediately after waxing: Otherwise, it can cause varying degrees of wax loss and fail to provide good hydrophobic effects. The protective wax on the car paint has not yet fully adhered.
5
4
Share

What Causes the Electronic Parking Brake to Not Release?

Possible causes include failure of the parking brake ratchet mechanism or motor malfunction. Below is relevant information about electronic parking brakes: 1. Introduction: The professional term for the parking brake is auxiliary brake, which operates differently from the main brake system. It uses a steel cable connected to the rear brake shoes to apply braking force to the vehicle. A return spring is used in conjunction with the parking brake—when the parking brake is engaged, the spring stretches; when released, the spring returns to its original length. Prolonged use of the parking brake can cause the spring to deform. 2. Precautions: Activating the electronic parking brake requires pressing the brake pedal first, along with a response time for the button (to prevent accidental operation). Additionally, the motor operation time is relatively long, approximately 0.5 seconds.
11
3
Share

Should the AC be turned on when using air conditioning?

When using the cold air in a car, the AC button needs to be turned on. Some cars are equipped with automatic air conditioning, and pressing the AUTO button will also activate the AC automatically. Below is relevant information about car air conditioning: 1. Introduction to car air conditioning: The car air conditioning device (air-conditioning-device), referred to as car AC, is used to adjust and control the temperature, humidity, air cleanliness, and airflow inside the car cabin to the optimal state. It provides a comfortable riding environment for passengers, reduces travel fatigue, and creates good working conditions for the driver, playing an important role in ensuring safe driving. 2. Car air conditioning system: Generally includes refrigeration devices, heating devices, and ventilation devices. This combined system makes full use of the limited space inside the car, has a simple structure, and is easy to operate, making it a popular modern car air conditioning system internationally.
19
2
Share

Are 3.00-10 and 90/90-10 Interchangeable?

Not interchangeable. 3.0-10 is the size designation method for ordinary tires, where 3.0 indicates the tire width in inches, and the following number 10 represents the rim size in inches. For 90/90-10, the 90/90 at the front denotes the tire width/height ratio, representing the aspect ratio of the tire, while the 10 indicates the rim diameter, also in inches. Since the two numerical conversions do not match in size, they cannot be used interchangeably. If the tire sizes are not significantly different, they may be considered for interchangeability based on the situation. Below are some relevant details about tire maintenance: 1. Tire Care: The matching of tires with the vehicle body forms the overall external image of the car. Tires play a pivotal role in the car's appearance, so tire care and beautification should not be overlooked. 2. Water Rinse: The current practice for tire maintenance primarily involves rinsing off mud from the tires with water or using cleaning agents to remove other dirt adhering to the tires. This maintenance method, if graded, should be classified as the most basic level of care. The sole function of this method is to clean off mud, as most dirt adhering to the tire rubber cannot be removed with ordinary cleaning agents.
6
3
Share

How Long After Failing the Second Driving Test Can You Retake It?

You can retake the second driving test 10 days after failing it. Below is a detailed introduction to the driving test: 1. Subjects: The test is conducted in the order of Subject One, Subject Two, Subject Three, and Subject Four. In the Subject Three test items, the new regulations circulating online also place more emphasis on the driver's safety and civilized awareness. 2. Retake: For the driving test, Subjects Two and Three can only be taken five times each. If you fail, you will have to pay the tuition fee again. According to the Ministry of Public Security's Order No. 123 and 124, if you still fail the fifth scheduled test for Subject Two or the road driving skills test of Subject Three, all previously passed subjects will be invalidated. If you want to obtain a driver's license, you will have to re-register and pay the tuition fee to the driving school.
17
2
Share
Cookie
Cookie Settings
© 2025 Servanan International Pte. Ltd.