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4.3 is the diameter of the hole in mm. But I don't understand the 4- part. Usually that's like a screw size but I haven't seen it like this before.

edit: as one commenter said I think it's just to indicate there are 4 holes

enter image description here

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  • $\begingroup$ I guess it is the nominal size followed by the actual size with allowable tolerance. $\endgroup$
    – r13
    Mar 13 at 23:43
  • $\begingroup$ I agree with @r13 although this is non standard. Another possibility is it’s a typo of 4 X if this appears in four places - which might be clear from context? $\endgroup$ Mar 14 at 0:50
  • $\begingroup$ 4.3 mm = 0.169 inches. Since the other dimension also seems to be in both units, I guess the "4 -" is something different, for example "4 locations." $\endgroup$
    – alephzero
    Mar 14 at 0:53
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    $\begingroup$ @31141 Please post a larger area of the drawing, to include more details that having similar notation, can help to identify the labelling/drafting convention the designer/drafter was using. $\endgroup$
    – r13
    Mar 14 at 16:38
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    $\begingroup$ Context, context, context! As r13 says, we need to see more of drawing to be definitive. Is there 4 holes and 3 without dimensions? $\endgroup$ Mar 14 at 21:39

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