Application of self-tapping screws

Update:01-02-2019
Summary:

When screwing in a self-tapping screw, power (called sc […]

When screwing in a self-tapping screw, power (called screwing torque) is required to form or cut the internal thread of the connection. Since the torque is connected, the screw is tightened and reached a certain degree after being installed in place. Make the ultimate torque) until the screw breaks. Twisted or threaded off. The hydrogen self-tapping screws are pulled out from the connecting parts, causing the self-tapping screws to break.

In the application of various self-tapping screws, the most important question is “How much is the correct tightening torque? How much torque should you use to screw in the screws and tighten the connections without damaging the screws or connectors?”

Obviously, the correct screwing torque is a certain value between the screwing torque and the limit torque. However, it is obviously unreasonable to recommend the intermediate value as the optimum value. However, several factors will affect the screwing torque and the limit. The size of the torque mainly includes: the form of the self-tapping screw, the size of the specification, and the chemical composition of the material of the connector. Hardness and thickness, as well as the method of self-tapping screws to machine pre-formed holes, but the most important is the aperture of the pre-made holes to be screwed into the self-tapping screws, all other factors will affect the aperture.

The final determination of size is the most important. If the hole is too large, the self-tapping screw can be easily screwed in, but it is not good for the connection. The self-tapping screw may be pulled out at a relatively low limit torque. If it is too small, the screwing torque will be too large and the self-tapping screws will be broken. Even though self-tapping screws can be installed in place and with fasteners, the range between screw-in torque and ultimate torque will be narrow. As a result, it is likely to be destroyed in production assembly.

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