ᐅ Why do wood screws often come loose?

Lately, I have been experiencing an increasing problem with cam lock screws frequently loosening, even when they were properly tightened. The question I want to discuss here is: why do cam lock screws often come loose? Specifically, I am interested in the possible causes for the loosening of the screw connection, despite the absence of any obvious mechanical overload. What role do factors like vibrations, material properties, or installation errors play? Are there different quality characteristics of cam lock screws that affect this issue? I look forward to well-founded answers and tips on how to solve this problem.

Hello Nikechen,

You’re addressing a common issue. Confirmat screws often come loose because they are not properly secured during installation, or the materials and surface treatments used are not ideal. Vibrations also contribute to the loosening of the screw connection. Another important factor is the correct tightening method – using too little torque causes screws to loosen quickly, while too much torque can damage the threads.

Additionally, there are different types of confirmat screws with varying thread tolerances, which affect the fit and, therefore, the likelihood of loosening.

I recommend using thread-locking compounds or lock washers and paying close attention to the correct torque specifications when retightening the screws.

Ixvin schrieb:
Vibrations also cause the screw connection to loosen.

That’s true, but I often find that problems with Malm screws are more due to poor manufacturing quality. If you buy cheap screws, you often get ones that just don’t hold properly, no matter how many times you tighten them. It seems many people buy low-cost screws and then wonder why they don’t hold.

Additionally, many underestimate the importance of using the correct screw length and appropriate application. Malm screws are designed for wood joints; using them in harder materials can lead to issues.

Malm screws often loosen due to the lack of securing measures (such as locking rings or adhesives) and not solely because of quality issues. Vibrations and incorrect tightening also play a significant role.

In addition to installation, the surrounding environment plays a role: moisture, temperature changes, and material swelling (in the case of wood) can cause screws to lose their grip. This is often overlooked with Malm screws.

For reference:

Malm screws are essentially specialized wood screws with a large thread pitch. Their loosening is promoted by the so-called "clearance" in the thread. Even slight vibrations can gradually loosen them without appropriate securing mechanisms, such as lock nuts or thread-locking adhesive.

Additionally, the screw length is crucial: a screw that is too short cannot sufficiently penetrate the workpiece, while a screw that is too long can cause material damage and reduced holding strength.

Using washers made of suitable materials can improve retention. Users should also ensure that the insertion depth and torque are precise.