Metric and Imperial screw size conversion

How does a 12 x 4 inch wood screw convert to Screwfix's metric range? is there a chart anywhere on the web? Thanks.
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Best Regards,
Chris
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--------------- That would make it a 5.5x100
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On Wed, 10 Sep 2003 23:38:03 +0100, Chris Wilson

On page 6 of the Screwfix catalogue there is a small chart which does give the gauge information, the sizes do not convert exactly, for example the metric equivalent of an imperial gauge 8 screw is 4.0 but a metric 4 is thinner than imperial gauge 8.
john.
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