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Screw Size Chart


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ProHold Balldrivers/Hex Keys
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Screw or Bolt    Decimal(in)Diameter     MM Diameter 

No.0 or 0-80       0.060 Inches              0.1524 MM 

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

No.3 or 3-48         0.099                          2.515 

No.4 or 4-40         0.112                         2.845 

No.5 or 5-40          0.125                        3.175 

No.6 or 6-32          0.138                        3.505 

No.8 or 8-32           0.164                       4.166 

No.10 or 10-32        0.190                      4.826 

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

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 (an M2 fastener of any kind is 2mm in diameter) in this case the M2 is only .184mm smaller than a 2-56.

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. (3mm vs. 2.845) </P> <font size ="5">Screw Size Chart </font size>