UNC to Metric / UNF to Metric

Comparison of inch threads and metric threads — Inch thread (UNC) vs. Metric Thread (M3)

Conversion data for UNC to metric fasteners for industrial bolts and machine screws. While metric screws and inch screws may appear similar, they possess different thread types and fundamental units. It's important to note that these screw types are not compatible and cannot be swapped interchangeably. The following conversion chart aims to illustrate the inch screws and metric screws that can be effectively compared.

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UNC to metric Converstion Chart

In the inch screw table for UNC, we provide a clear comparison of the most common sizes. On the left side of the table, you will find the UNC thread, and on the right side, the metric coarse thread (often referred to as standard thread). By juxtaposing them, one can quickly get an idea of which UNC thread is approximately equivalent to which metric thread, providing a rough estimation of the sizes as well.

Inch thread table		Metric coarse thread
UNC	Thread diameter outside in mm	Metric thread Size x Pitch	Thread diameter outside in mm
N 1 - 64	1,854 mm	M2 x 0.40	2,00 mm
N 3 - 48	2,515 mm	M2.5 x 0.45	2,50 mm
N 4 - 40	2,845 mm	M3 x 0.50	3,00 mm
N 6 - 32	3,505 mm	M3.5 x 0.60	3,50 mm
N 8 - 32	4,166 mm	M4 x 0.70	4,00 mm
N 10 - 24	4,826 mm	M5 x 0.80	5,00 mm
1/4" - 20	6,350 mm	M6 x 1.00	6,00 mm
5/16" - 18	7,938 mm	M8 x 1.25	8,00 mm
3/8" - 16	9,525 mm	M10 x 1.50	10,00 mm
1/2" - 13	12,700 mm	M12 x 1.75	12,00 mm
9/16" - 12	14,288 mm	M14 x 2.00	14,00 mm
5/8" - 11	15,875 mm	M16 - 2.00	16,00 mm
3/4" - 10	19,050 mm	M20 x 2.50	20,00 mm
7/8" - 9	22,225 mm	M22 x 2.50	22,00 mm
1" - 8	25,400 mm	M24 x 3.00	24,00 mm
1 - 1/8" - 7	28,575 mm	M27 x 3.00	27,00 mm
1 - 1/4" - 7	31,750 mm	M30 x 3.50	30,00 mm
1 - 1/2" - 6	38,100 mm	M36 x 4.00	36,00 mm
1 - 3/4" - 5	44,450 mm	M42 x 4.50	42,00 mm
2" - 4 1/2	50,800 mm	M48 x 5.00	48,00 mm

* All information without guarantee.

UNF to metric Converstion Chart

In the inch screw table for UNF, we provide a clear comparison of the most common sizes. On the left side of the table, you will find the UNF thread, while on the right side, you will find the metric fine thread. UNF inch screws serve as the equivalent to the European fine thread, offering a side-by-side reference for easy comparison.

Inch thread table		Metric fine thread
UNF	Thread diameter outside in mm	Metric fine thread Size x Pitch	Thread diameter outside in mm
1/4" - 28	6,350 mm	M6 x 0.75	6,00 mm
5/16" - 24	7,938 mm	M8 x 1.00	8,00 mm
3/8" - 24	9,525 mm	M10 x 1.25	10,00 mm
1/2" - 20	12,700 mm	M12 x 1.50	12,00 mm
9/16" - 18	14,288 mm	M14 x 1.50	14,00 mm
5/8" - 18	15,875 mm	M16 x 1.50	16,00 mm
3/4" - 16	19,050 mm	M20 x 1.50	20,00 mm
7/8" - 14	22,225 mm	M22 x 1.50	22,00 mm
1" - 12	25,400 mm	M24 x 2.00	24,00 mm
1 - 1/8" - 12	28,575 mm	M27 x 2.00	27,00 mm
1 - 1/4" - 12	31,750 mm	M30 x 2.00	30,00 mm
1 - 1/2" - 12	38,100 mm	M36 x 2.00	36,00 mm

* All information without guarantee.

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