Locking or bite often occurs on the screws of stainless steel, aluminum alloys, and titanium alloy materials. These metal alloy itself have anti-corrosion resistance, which will produce a thin layer of oxide in the metal surface when the surface is damaged. Prevent further rust . When the stainless steel screw is locked, the pressure and heat generated between the dental lines disrupts the oxide layer, causing blocking or shearing between the metal threads, thereby adherability. When this phenomenon continues, the stainless steel fastener will be completely locked, and no longer removal or continues to lock. Usually this series of blocked, shear, adhesive, and locking a series of movements occur in just a few seconds, so correctly understand the use of such fasteners to prevent this phenomenon.
Precaution:
1. Correctly select Product: Do you confirm whether the mechanical performance of the product before use can meet the needs of use, such as the tensile strength of the screw and the guarantee load of the nut. The length of the screw should be selected, and the nut is exposed to 1-2 teeth after tightening.
2. View whether the thread is rough before use, whether there is iron filled or dirt between the threads, which often lead to lock.
3. You can make lubrication to the fastener before use: It is recommended to use butter, molybdenum sulfide, mica, graphite or talc powder to do lubrication. At present, we are generally unwaxing treatment to make lubrication anti-lock.
Precautions:
1. The speed force of the screw should be appropriate, don't excel too much, use the torque wrench or sleeve wrench as much as possible to avoid using the active wrench or electric wrench. The speed will cause the temperature to rise rapidly and cause lock.
2. The direction of the bias, the nut must be screwed perpendicular to the axis of the screw.
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