Hello everyone,
I have noticed that my assembly work often involves Malm screws loosening, even though I have carefully tightened them. I am very interested in understanding why Malm screws seem particularly prone to loosening on their own, which doesn’t seem logical at first glance.
Are there specific characteristics of the thread type, material properties, or perhaps the influence of vibrations and loads that cause these issues? Does anyone have experience with this or can provide technical reasons why Malm screws tend to loosen repeatedly?
I look forward to your well-informed responses!
I have noticed that my assembly work often involves Malm screws loosening, even though I have carefully tightened them. I am very interested in understanding why Malm screws seem particularly prone to loosening on their own, which doesn’t seem logical at first glance.
Are there specific characteristics of the thread type, material properties, or perhaps the influence of vibrations and loads that cause these issues? Does anyone have experience with this or can provide technical reasons why Malm screws tend to loosen repeatedly?
I look forward to your well-informed responses!
Interesting question!
First of all, I would question the anchoring in the base material. Cavity anchors are specifically designed for hollow walls, where there is usually some extra space behind the wall. Due to regular vibrations and dynamic loads, the screw can gradually loosen even when fully tightened.
Yes, the thread geometry of cavity anchors is often relatively coarse to grip better inside the hollow space. This can lead to loosening caused by vibrations, especially with fluctuations in temperature and humidity. However, such effects should be minimal if installed correctly. Overall, I believe the cause lies in the combination of the hollow cavity, insufficient preload, and external loads.
First of all, I would question the anchoring in the base material. Cavity anchors are specifically designed for hollow walls, where there is usually some extra space behind the wall. Due to regular vibrations and dynamic loads, the screw can gradually loosen even when fully tightened.
DiErnest schrieb:
Are there any special features regarding the thread type, material characteristics, or perhaps the influence of vibrations and loads?
Yes, the thread geometry of cavity anchors is often relatively coarse to grip better inside the hollow space. This can lead to loosening caused by vibrations, especially with fluctuations in temperature and humidity. However, such effects should be minimal if installed correctly. Overall, I believe the cause lies in the combination of the hollow cavity, insufficient preload, and external loads.
Malm screws use expansion plugs or special cavity anchors. If the screw comes loose, it is usually due to:
1. Incorrect type of anchor or improper installation
2. Overloading or vibrations
3. Material fatigue
Tip: Check the anchor and always install according to the instructions.
1. Incorrect type of anchor or improper installation
2. Overloading or vibrations
3. Material fatigue
Tip: Check the anchor and always install according to the instructions.
Interesting, I suspect many people overestimate the holding power of these screws.
That’s exactly the problem! The cavity creates play, and the material they grip is often nothing more than thin drywall.
I would argue that most damage is not caused by a weakness of the screw itself, but simply because the substrate does not provide enough support. And honestly: who really checks the quality of the anchors or whether the wall is stable enough every time? These errors are denied, while Malm screws are criticized unfairly.
Natan schrieb:
Malm screws are specially designed for hollow walls, where there is usually a larger gap behind the wall
That’s exactly the problem! The cavity creates play, and the material they grip is often nothing more than thin drywall.
I would argue that most damage is not caused by a weakness of the screw itself, but simply because the substrate does not provide enough support. And honestly: who really checks the quality of the anchors or whether the wall is stable enough every time? These errors are denied, while Malm screws are criticized unfairly.
Frequent loosening often occurs when vibrations from the base material are underestimated.
Malm screws have an expansion function that prevents them from loosening uncontrollably, but under dynamic loads, the material responds. Both the screw and the anchor can slowly deform.
Malm screws have an expansion function that prevents them from loosening uncontrollably, but under dynamic loads, the material responds. Both the screw and the anchor can slowly deform.
Thank you for the very helpful feedback so far!
One more question for the experts: Would the problem be mitigated by using a type of clamping or locking screw in addition, or would it be better to proactively apply Loctite or something similar without compromising the function of the hollow wall anchor?
Or is it generally more advisable to use different screws or anchors in such cases, especially when dealing with load and vibrations?
One more question for the experts: Would the problem be mitigated by using a type of clamping or locking screw in addition, or would it be better to proactively apply Loctite or something similar without compromising the function of the hollow wall anchor?
Or is it generally more advisable to use different screws or anchors in such cases, especially when dealing with load and vibrations?
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