A machine drawing specifies an M12 screw for assembly. What does 'M12' indicate about the screw?
The major diameter of the screw is 12 mm
In the ISO metric thread designation, the letter M is followed by a number that states the nominal size of the thread in millimetres.
That nominal size is the major (outside) diameter of the external thread, measured across the crests.
So M12 means a metric thread whose major diameter is 12 mm; it does not refer to the screw's length, pitch or head size.
Hence, the answer is **The major diameter of the screw is 12 mm**.
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