Tension strength of a 2.5 inch #8 Zinc screw


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Old 06-15-10, 03:18 PM
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Tension strength of a 2.5 inch #8 Zinc screw

I'm planning on installing a 40 lb ceiling fan with two 2.5 inch #8 zinc wood screws. Will these hold up to the forces placed on them? They will be screwed into a ceiling joist.

Thanks,
Adam
 
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Old 06-15-10, 04:08 PM
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They are zinc plated for some corrosion resistance..not made of zinc..which is a very weak metal.

Personally I'd probably go for #10 or larger.
 
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Old 06-15-10, 04:21 PM
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Thanks gunguy. Came to my rescue again. You actually helped me nearly two years ago on a windows question.
 
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Old 06-15-10, 04:24 PM
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Very welcome. #10 machine screws are what most fan boxes use I believe...whereas #8 is common for typical light fixtures.
 
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Old 06-16-10, 03:46 AM
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I have had better luck when using the premium, corrosion resistant, deck screws meant for use with ACQ lumber. The steel seems to be higher quality and they seem to be much stronger than cheap wood screws or cheap deck screws.
 
 

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