Hardware knowledge: how to prevent stainless steel fasteners from being locked

1. Correct selection of products: Before use, confirm whether the mechanical properties of the product can meet the requirements of use, such as the tensile strength of the screw and the guaranteed load of the nut. The length of the screw should be properly selected to tighten the nut and expose the nut 1-2 teeth.

2, check whether the thread is rough before use, whether there is iron filings or dirt between the threads, these things often lead to lock.

3, the fastener can be lubricated before use: it is recommended to use butter, molybdenum disulfide, mica, graphite or talcum powder for lubrication, the current use of wax treatment to do lubrication and anti-lock.

4, pay attention to the use of:

a. The speed of the screwing should be appropriate. Do not use it too fast. Use a torque wrench or a socket wrench as much as possible to avoid using an adjustable wrench or an electric wrench. Too fast will cause the temperature to rise rapidly and cause lockup. Imported pump valve

b. The direction of the force applied, the nut must be screwed perpendicular to the axis of the screw.

5, the use of gaskets can effectively prevent the problem of over-tightening.

6, lock or bite often occurs in stainless steel, aluminum alloy and titanium alloy fasteners, these metal alloys have anti-corrosion properties, will produce a thin layer of oxide on the metal surface when the surface is damaged To prevent further rust. When the stainless steel fasteners are locked, the pressure and heat generated between the teeth will damage the oxide layer, causing blockage or shearing between the metal threads, and then sticking. When this phenomenon continues, the stainless steel fasteners will be completely locked and will no longer be able to be removed or remain locked. Usually a series of blocking_clip_adhesive_locking actions take place in a few seconds, so correct understanding of the use of such fasteners can prevent this phenomenon.

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Tag: Locked Electric wrench Stainless steel fastener Torque wrench Speed ​​power

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