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Wood screw size

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Old 07-10-2003, 08:27 PM
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jacs
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Default Wood screw size

Hi

Found a servo screw at www.microfasteners.com with a size of #2 x 9/16. My question is what size is the first one the other is 14.28mm for me here in Sweden. I have looked at www.sizes.com and there is no input on the subject.
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Old 07-11-2003, 12:05 AM
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CurtD
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Default Wood screw size

The outer thread diameter for a #2 sheet metal screw is approximately 2.2 mm. The screws from Microfasteners you're looking at for servo mounting are the best I've found. I use them almost exclusively.

I would use a 1.5 mm drill bit for the pilot hole.

Hope this helps!
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Old 07-11-2003, 06:40 AM
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jacs
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Default Wood screw size

Thanks

It's the servo mounting screws that I'm been looking at but for me that uses metric system it's hard to find information on ex. 4-40 the last number being how many threads per inch but the first is it 4 inches or .4 or .04. I don't know.
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Old 07-11-2003, 11:35 AM
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motorbuzz
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Default Wood screw size

These are American standard sizes for machine screws:

Diameter of Number sized threads is calculated as:
0.060 + (0.013*N) N=Size number of screw

0 = 0.060 diameter in inches
1 = 0.073
2 = 0.086
3 = 0.099
4 = 0.112
5 = 0.125
6 = 0.138
8 = 0.164
10 = 0.190
12 = 0.216

So a 4-40 screw would be .112 inches in diameter with 40 threads per inch.

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Old 07-11-2003, 12:01 PM
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jacs
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Default Wood screw size

The same applize for wood screw also or ?

#2 x 9/16 would be 0.06+(0.013*2)= 0.086 inch = 2.2 mm

If this information is correct I thank you
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Old 07-11-2003, 12:45 PM
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motorbuzz
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Default Wood screw size

I've just checked my hardware stash. A #4 wood screw measured .112 inch and a #2 wood screw measured .086 inch. So at least for these two sizes, they seem to be the same diameter as machine screws.

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