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″ |
|