English
Created on 07.10
Preventive measures for the lockout failure of stainless steel fasteners
First, let's define what a shaft is: A shaft is defined as the component that links the main parts of a product and is used in rotational operations. It must be able to withstand both bending moments and torques. Such a shaft is called a "shaft".
Fasteners are usually referred to as standard parts in the market. They are a general term for a category of mechanical parts used to securely connect two or more components (or parts) into a single unit. Their characteristics include a wide variety of types and specifications, diverse performance and applications, as well as a high degree of standardization, series production, and generalization. Fasteners are widely used mechanical components with a large demand.
Steps/Methods
- Select the product correctly: Before use, confirm whether the mechanical performance of the product can meet the usage requirements, such as the tensile strength of the screw and the guaranteed load of the nut. The length of the screw should be appropriately selected, with 1-2 tooth pitches exposed after tightening.
- Check the thread before use for roughness, and whether there are iron filings or dirt between the threads. These substances often cause locking.
- Before use, you can apply lubrication to the fastener: It is recommended to use grease, molybdenum disulfide, mica, graphite or talcum powder for lubrication. Currently, wax immersion treatment is commonly used for lubrication to prevent locking.
- Pay attention to the usage method:
a. The speed and force of insertion should be appropriate. Do not insert too fast or too forcefully. Try to use a torque wrench or socket wrench as much as possible, and avoid using an adjustable wrench or electric wrench. Inserting too fast will cause the temperature to rise rapidly, leading to locking. Import pump valves
b. The direction of force application, the nut should be inserted perpendicular to the axis of the screw.
5. Using washers can effectively prevent the problem of excessive locking.
6. Locking or biting occurs frequently on fasteners made of stainless steel, aluminum alloy, and titanium alloy materials. These metal alloys have anti-corrosion properties and will generate a thin oxide layer on the surface when damaged to prevent further rusting. When the fastener made of stainless steel is locked, the pressure and heat generated between the teeth will destroy this oxide layer, causing obstruction or shear between the metal teeth, and then leading to adhesion. When this phenomenon persists, the stainless steel fastener will be completely locked and cannot be disassembled or relocked. Usually, this series of blocking, shearing, adhesion, and locking actions occur within just a few seconds. Therefore, correctly understanding the use of such fasteners can prevent this phenomenon.