Metric > Imperial Screw Sizes

Metric                          Metric Fine                   BSF/BSW                 UNC                           UNF      
M2 x 0.4 –                             –                          1-64                    1-72                      
M2.5 x 0.45 3-48 3-56
M3 x .05 4-40 4-48
M3.5 x .06 6-32 6-40
M4 x .07 8-32 8-36
M5 x .08 10-24 10-32
M6 x 1 M6 x 0.75 1/4 1/4-20 1/4-28
M8 x 1.25 M8 x 1 5/16 5/16-18 5/16-24
M10 x 1.5 M10 x 1.25          3/8    3/8-16         3/8-24      
M12 x 1.75 M12 x 1.25 1/2 1/2-13 1/2-20
M14 x 2 M14 x 1.5 9/16 9/16-12 9/16-18
M16 x 2 M16 x 1.5 5/8 5/8-11 5/8-18
M20 x 2.5 M20 x 1.5 3/4 3/4-10 3/4-16
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