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" |
| 
