I want to order screws like the one I have. The diameter of the threaded portion is 2mm. The length of the threaded portion is 8mm.
The screws are listed as Mn (where n is 1.6,2,2.5...) on various sites. The length parameter is also specified.
I have a feeling that the n represent the diameter of the threaded portion however even after having searched a lot I found no document that explicitly states this. Some documents state diameter=M2. So M2 relates to the diameter. But 2 could be in mm, 1/10 of an inch or it could be like shoe size where the number is not a dimension in itself but simply represents one of the many standard sizes.
Side note: I wonder why something as basic as this is not documented clearly. Specs generally go into excruciating detail which includes the naming convention. Where should I have looked for the meaning of this convention? I have gone through ISO-7045 but even it does not state what the n in Mn means.