Metric Thread Pitch Table – Sizes & Charts (Monster Bolts)
Metric fasteners differ drastically from their US counterparts and are absolutely not interchangeable. US screws use Threads Per Inch (TPI), while metric screws use Thread Pitch, which is the distance in millimeters between two thread peaks. The smaller the pitch number, the finer the thread.
For example, an M8 screw with a standard thread pitch has 1.25 mm between each thread peak. A helpful trick is to measure the distance across 10 threads, then move the decimal point one place to the left — this makes identifying the pitch easier and more accurate than trying to measure a single thread spacing.
Metric Thread Pitch Chart
| Screw Size | Standard / Coarse Pitch (mm) | Fine Pitch (mm) |
|---|---|---|
| M1.6 | 0.35 | – |
| M2 | 0.40 | – |
| M2.5 | 0.45 | – |
| M3 | 0.50 | – |
| M3.5 | 0.60 | – |
| M4 | 0.70 | – |
| M5 | 0.80 | – |
| M6 | 1.00 | – |
| M8 | 1.25 | 1.00 |
| M10 | 1.50 | 1.25 |
| M12 | 1.75 | 1.50 |
| M14 | 2.00 | 1.50 |
| M16 | 2.00 | – |
| M18 | 2.50 | – |
| M20 | 2.50 | – |
Need metric screws? Explore our full metric fastener collection with same-day shipping from Milton, Florida.