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Screw or Bolt        Diameter                 Diameter          Closest 
Size                     Inches                       MM            Metric Screw 

No.0 or 0-80           0.060 Inches         1.524 MM          M1.5

No.1 or 1-64           0.073                    1.854                M2
No.2 or 2-56           0.086                    2.184                M2

No.3 or 3-48           0.099                    2.515                M2.5

No.4 or 4-40           0.112                     2.845                M3
No.5 or 5-40           0.125                    3.175                 M3
No.6 or 6-32           0.138                    3.505                M3.5

No.8 or 8-32           0.164                    4.166                 M4

No.10 or 10-32        0.190                   4.826                 M5

"1/4"" or 1/4-20"     0.245                    6.223                 M6

How to read this chart:
 As an example:

A #2 pointy screw or a 2-56 Socket Head Cap Screw would be very close to an M2 Screw or bolt

Another example: What size metric fasteners would be very close to a #4 or 4-40 fastener. Answer would be an M3, because as you can see by the chart, it is only slightly larger. Screw Size Chart</p>