| Bolt Diameter | Standard Thread Pitch (mm) | Fine Thread Pitch (mm) | Extra Fine Thread Pitch (mm) |
| 4mm | 0.70 | - | - |
| 5mm | 0.80 | - | - |
| 6mm | 1.00 | - | - |
| 7mm | 1.00 | - | - |
| 8mm | 1.25 | 1.00 | - |
| 10mm | 1.50 | 1.25 | 1.00 |
| 12mm | 1.75 | 1.50 | 1.25 |
| 14mm | 2.00 | 1.50 | - |
| 16mm | 2.00 | - | - |
| 18mm | 2.50 | - | - |
| 20mm | 2.50 | - | - |
| 24mm | 3.00 | - | - |
| Size Identification: Metric bolts are written down as an "M" followed by 3 numbers. For example M10x1.25x35 The first number is the diameter, the second the thread pitch, and the third the length all in millimeters. The example is therefore a 10mm diameter fine thread bolt 35mm long. | |||
| Thread pitch: The distance from one thread to the next, measured down the length of the fastener. | |||