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Summary: The different sizes of screws and the conversion from metric to imperial sizes.
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Screw sizes are a mystery to most people so we have tried to make life a little easier with the table below. A wood screw is sized by two different numbers. First is the diameter of the screw. The larger 
the number, the larger the diameter. A number 4 screw is much smaller than a number 12 screw. The length is given next and it should be remembered that the length given for a screw is the length that is buried in the wood or other material, it does not onclude the head of raised, or domed headed screws.
pozidrive/supadrive screw. They both require a different driver which can be found below.
See also our project on different types of screw and Countersinking. Pilot holes should also be used when insering screws.
Metric/Imperial Conversion Chart |
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Gauge |
Length |
Imperial |
Gauge |
Length |
Imperial |
3 |
12 |
4 x 1/2 |
3.5 |
12 |
6 x 1/2 |
16 |
4 x 5/8 |
16 |
6 x 5/8 |
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20 |
4 x 3/4 |
20 |
6 x 3/4 |
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25 |
4 x 1 |
25 |
6 x 1 |
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30 |
4 x 1 1/4 |
30 |
6 x 1 1/4 |
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40 |
4 x 1 1/2 |
40 |
6 x 1 1/2 |
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4 |
12 |
8 x 1/2 |
4.5 |
25 |
9 x 1 |
16 |
8 x 5/8 |
30 |
9 x 1 1/4 |
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20 |
8 x 3/4 |
35 |
9 x 1 3/8 |
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25 |
8 x 1 |
40 |
9 x 1 1/2 |
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30 |
8 x 1 1/4 |
45 |
9 x 1 3/4 |
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35 |
8 x 1 3/8 |
50 |
9 x 2 |
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40 |
8 x 1 1/2 |
60 |
9 x 2 3/8 |
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45 |
8 x 1 3/4 |
70 |
9 x 2 3/4 |
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50 |
8 x 2 |
75 |
9 x 3 |
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60 |
8 x 2 3/8 |
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70 |
8 x 2 3/4 |
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5 |
25 |
10 x 1 |
6 |
30 |
12 x 1 1/4 |
30 |
10 x 1 1/4 |
40 |
12 x 1 1/2 |
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35 |
10 x 1 3/8 |
50 |
12 x 2 |
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40 |
10 x 1 1/2 |
60 |
12 x 2 3/8 |
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45 |
10 x 1 3/4 |
70 |
12 x 2 3/4 |
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50 |
10 x 2 |
75 |
12 x 3 |
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60 |
10 x 2 3/8 |
80 |
12 x 3 1/4 |
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70 |
10 x 2 3/4 |
90 |
12 x 3 1/2 |
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75 |
10 x 3 |
100 |
12 x 4 |
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80 |
10 x 3 1/4 |
110 |
12 x 4 3/8 |
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90 |
10 x 3 1/2 |
130 |
12 x 5 1/8 |
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100 |
10 x 4 |
150 |
12 x 6 |
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