Metric Conversion Tables

Metric Conversion Tables

The following charts will help understanding the Threads and Diameters in metric fasteners and their conversion to US Standard Inches.

Metric Thread Diameter Diameter Conversion
Standard Pitch

Fine Pitch

Metric MM Inch Aprox Pitch MM
M 3 x 0.5 3 4-40 0.5
M 4 x 0.7 3.5 6-32 0.6
M 5 x 0.8 4 8-32 0.7
5 10-24 0.8
M 6 x 1.0 6 1/4″ 1.0
M 8 x 1.25 M 8 x 1.0 7 9/32″ 1.0
M 10 x 1.5 M 10 x 1.25 8 5/16″ 1.25
M10 x 1.0 10 3/8″ 1.5
M12 x 1.75 M 12 x 1.25 12 1/2″ 1.75
M 12 x 1.5 14 9/16″ 2.0
M 14 x 2.0 M 14 x 1.5 16 5/8″ 2.0
M 16 x 2.0 M 16 x 1.5 18 11/16″ 2.6
M 18 x 2.5 M 18 x 1.5 20 3/4″ 2.5
22 7/8″ 2.5
M 20 x 2.5 M 20 x 1.5 24 1″ 3.0
M 22 x 2.5 M 22 x 1.5 27 1 1/16″ 3.0
M 24 x 3.0 M 24 x 2.0 30 1 3/16″ 3.5
M 27 x 3.0 M 27 x 2.0
M 30 x 3.5 M 30 x 2.0

 

M Inch Aprox Metric MM Inch Aprox
1 3/64″ 90 3 1/2″
1.5 1/16″ 100 4″
2 5/64″ 110 4 3/8″
3 1/8″ 120 4 3/4″
4 5/32″ 130 5″
5 3/16″ 140 5 1/2″
6 1/4″ 150 6″
8 5/16″ 160 6 1/4″
10 3/8″ 170 6 3/4″
12 1/2″ 180 7″
14 9/16″ 190 7 1/2″
16 5/8″ 200 8″
18 11/16″ 220 8 3/4″
19 3/4″ 240 9 9/16″
20 3/4″ 260 10 1/4″
25 1″ 270 10 3/4″
30 1 3/16″ 280 11″
35 1 3/8″ 300 12″
40 1 9/16″ 320 12 1/2″
45 1 3/4″ 340 13 1/2″
50 2″ 360 14 1/4″
55 2 3/16 380 15″
60 2 3/8″ 400 15 3/4″
65 2 9/16″ 420 16 1/2″
70 2 3/4″ 440 17 3/8″
75 3″ 460 18″
80 3 3/16″ 480 19″
85 3 3/8″ 500 20″

 

 

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