I would like to find out what English units of measure are for a screw size described as ST5X70. Where can I get this information?
Screw Size Unit Conversion
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A standard #10 screw has an outer thread diameter of 3/16". The #10 countersink you are referring to is a combined tool designed for applications where the screw is to pass completely through the material without digging the threads into the wood and have the head sit flush. If you wish to use a screw that is actually going to grip the material, such as a wood screw or self-tapping screw, do not buy the item. Instead you will need an appropriately sized #10 pilot drill (3/32" for soft wood, 7/64" for hardwood) and a separate countersink bit designed for your chosen screw size.
So, the answer depends on the application. If you intend for the screw to pass completely through the first work piece with nothing but the head securing it (no threads biting into the wood) then the combined #10 drill/countersink is great. If you intend for the screw to bite the material, you need a separate pilot drill and countersink bit.
Sounds like Sebo?
The M4 diameter relates to the diameter of the thread not the head though. A M4 thread will typically have a 7mm wide head.
Googling "Sebo M 4 x 10K" seems to find a few references to that screw size.
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Best Answer
That would be a self tapping screw with a diameter of 5 mm, and a length of 70 mm. In English units it would be a self tapping screw with a diameter between 3/16" and 13/64" (0.1969"), and a length of 2 3/4".