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.
GLORIA schrieb:
Moreover, the screw length is crucialExactly. Not only the length but also the core material of the screw and its torsional strength are critical for stability. Cheap screws made from softer steel lose their grip more quickly.
Thank you for the responses so far. I am particularly interested in the installation process – how important is the torque range for Malm screws, and are there common mistakes that cause loosening? Is it more problematic to overtighten or undertighten? And can the torque on Malm screws be accurately controlled with a standard torque wrench setting?
Nikechen schrieb:
How important is the torque range and are there common mistakes?Torque is very important. If fastened too loosely, parts can come undone due to vibration; if tightened too much, the threads can be damaged and holding strength reduced. A common mistake is tightening “by hand tight” without torque control. Using a torque wrench is definitely recommended, but it should be set within the range specified for the screws and materials involved.
Malm screws are often used in wood, which is sensitive to over-tightening. Therefore, it’s better to stick to the lower end of the torque range.
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Issac_kla224 Aug 2015 10:45Nikechen schrieb:
Can this be controlled with a conventional torque wrench?When people say "conventional," they often mean something imprecise. In my opinion, you really need a quality tool with fine adjustability. Otherwise, it’s no use, and the screws will still loosen. But of course, there are also limits imposed by the material.
In conclusion:
The common causes for Malm screws frequently loosening are a) insufficient tightening torque, b) lack of vibration-proof locking mechanisms, c) unsuitable screw quality, d) incorrect screw length, and e) changes in materials or environmental influences such as moisture affecting wood.
For greater reliability, it is important to follow the screw manufacturer's installation instructions, use appropriate locking methods (e.g., thread-locking adhesive or spring washers), and verify the tightening torque.
The common causes for Malm screws frequently loosening are a) insufficient tightening torque, b) lack of vibration-proof locking mechanisms, c) unsuitable screw quality, d) incorrect screw length, and e) changes in materials or environmental influences such as moisture affecting wood.
For greater reliability, it is important to follow the screw manufacturer's installation instructions, use appropriate locking methods (e.g., thread-locking adhesive or spring washers), and verify the tightening torque.
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