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Old 03-17-2012, 10:55 AM
frankc

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The coeficient of thermal expansion is different for the screw and aluminum. This plays a part in how tight a screw is at different temperatures. One of the properties of Loktite or other materials used in a screwed connection is to maintain screw tension at a reasonable temperature range.

Some complain a screw is too tight while others say the screws back out with use. It just goes with the territory.

Test the torque on head bolts in an engine at different temperatures and there will be a difference. The designers have to take this into consideration when designing the equipment. That is why retorqing a bolt is important after using the equipment. Screw size, materials, temperature variations and other factors come into play especially with small screws in dissimilar materials. You can beat this subject to death and not come up with a solution which is acceptable to everyone. It is what it is.

I have seen grade 8 high strength 5/8" bolt heads fracture from vibration and all sorts of torque problems over the years. If the screws are too loose on your assembly, then tighten them. If they are too tight, try them at another temperature.
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