UNC to metric fasteners conversion data for industrial bolts und machine screws. Metric screws and inch screws are very similar, but they are different thread types and basic units. The screw types are not compatible and cannot be interchanged. In the following conversion chart we would like to show you which inch screws and which metric screws can be compared with each other.
Inch Equivalent UNC |
Coarse Metric Size x Pitch |
1 - 64 | M2 x 0.40 |
3 - 48 | M2.5 x 0.45 |
4 - 40 | M3 x 0.50 |
6 - 32 | M3.5 x 0.60 |
8 - 32 | M4 x 0.70 |
10 - 24 | M5 x 0.80 |
1/4 - 20 | M6 x 1.00 |
5/16 - 18 | M8 x 1.25 |
3/8 - 16 | M10 x 1.50 |
7/16 - 14 | M12 x 1.75 |
1/2 - 13 | M14 x 2.00 |
9/16 - 12 | M16 - 2.00 |
5/8 - 11 | M20 x 2.50 |
3/4 - 10 | M22 x 2.50 |
7/8 - 9 | M24 x 3.00 |
1 - 8 | M27 x 3.00 |
1 - 1/8 - 7 | M30 x 3.50 |
1 - 1/4 - 7 | M36 x 4.00 |
1 - 3/8 - 6 | M42 x 4.50 |
1 - 1/2 - 6 | M48 x 5.00 |
* All information without guarantee.
Inch Equivalent UNF |
Fine Metric Size x Pitch |
1/4 - 20 | M6 x 0.75 |
5/16 - 24 | M8 x 1.00 |
3/8 - 16 | M10 x 1.25 |
7/16 - 14 | M12 x 1.50 |
1/2 - 13 | M14 x 1.50 |
9/16 - 12 | M16 x 1.50 |
5/8 - 11 | M20 x 1.50 |
3/4 - 10 | M22 x 1.50 |
7/8 - 9 | M24 x 2.00 |
1 - 8 | M27 x 2.00 |
1 - 1/8 - 7 | M30 x 2.00 |
1 - 1/4 - 7 | M36 x 2.00 |
1 - 3/8 - 6 | M42 x 2.00 |
1 - 1/2 - 6 | M48 x 2.00 |
* All information without guarantee.