I doubt I'm the only one whose wondered this so will go ahead and ask it. Laugh if you want if you will, but I don't understand how to read screw notation for metric. I know what I need as I can look it up, but don't understand what each element represents in the notation.

I work in IT and computer software has defined notations/syntax, so I have no problem picking it up. Just don't know what it is,

Example: Losi 8ight 2.0 needs a screw, the size is 5-40 X 1/2" BH Screws . My D8T lost one that was M2.2x4.8mm. These seem like different notations. Is that true?If so, what are the types of notations?

Can someone specifically break down those two notations above?

i.e. Where is the head, thread design, lenth/width, etc. noted?

Thanks!</p>