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Hardware knowledge: how to prevent stainless steel fasteners from being locked
1. Select the product correctly: 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 selected appropriately, which shall be subject to 1-2 pitches of the exposed nut after tightening.
2. Check whether the threads are rough before use, and whether there are iron filings or dirt between the threads. These things often cause lockup.
3. Lubricate the fasteners before use: It is recommended to use butter, molybdenum disulfide, mica, graphite or talc for lubrication. At present, wax dipping is commonly used for lubrication and anti-locking.
4. Pay attention to the method of use:
a. The speed and force of screwing in should be appropriate, not too fast or too big. Use torque wrenches or socket wrenches as much as possible, and avoid using adjustable wrenches or electric wrenches. Too fast will cause the temperature to rise rapidly and cause lock-up. Import pump valve
b. In the direction of force, the nut must be screwed in perpendicular to the axis of the screw.
5. The use of washers can effectively prevent the problem of over-locking.
6. Locking or seizure often occurs on fasteners made of stainless steel, aluminum alloy and titanium alloy materials. These metal alloys themselves have anti-corrosion properties and will produce a thin layer on the metal surface when the surface is damaged. The oxide layer to prevent further corrosion. When the stainless steel fasteners are locked, the pressure and heat generated between the teeth will destroy this oxide layer, causing blockage or shearing between the metal threads, and then adhesion. When this phenomenon continues to occur, the stainless steel fasteners will be completely locked and can no longer be removed or continued to be locked. Usually this series of blocking, shearing, adhering, and locking actions take place in just a few seconds, so a correct understanding of the use of such fasteners can prevent this phenomenon.