Threads / Size reference
M20x2 Metric fine
M20x2 has a nominal outside diameter of 20 mm and a 2 mm pitch.
0.787402 in
12.7 TPI · calculated
Nominal dimensions; no class allowances or acceptance limits applied. M sizes state diameter and pitch in millimetres.
same diameter comparison
M20x2 vs M20x2.5
M20x2.5 Metric coarse shares the nominal diameter but has a 2.500000 mm pitch. The pitch difference is 0.500000 mm; these are different nominal threads.
Swipe to compare both sizes →
| Property | M20x2 Metric fine | M20x2.5 Metric coarse |
|---|---|---|
| Nominal diameter · in | 0.787402 | 0.787402 |
| Nominal diameter · mm | 20 | 20 |
| Threads per inchDifferent | 12.7 | 10.16 |
| Pitch · mmDifferent | 2 | 2.5 |
All 3 options at this diameter
Swipe to see all columns →
| Designation | Major Ø · in / mm | TPI | Pitch · mm | Drill evidence | Next step |
|---|---|---|---|---|---|
| M20x2.5 Metric coarse | 0.787402 / 20 | 10.16 converted | 2.5 | Chart row | Tap-drill lookup → |
| M20x1.5 Metric fine | 0.787402 / 20 | 16.933333 converted | 1.5 | Chart row | Tap-drill lookup → |
| M20x2 Metric fine | 0.787402 / 20 | 12.7 converted | 2 | Equation only | Tap-drill lookup → |
Tapping-hole evidence for M20x2
No reviewed chart row for M20x2 Metric fine
You can calculate a theoretical hole with the cited equation. It is not a stocked-drill selection or a tool-specific hole range.
Need acceptance limits?
The complete class and applicable drawing requirements are needed. These nominal values are not maximum/minimum inspection limits.
Part has no marking?
Measure the correct diameter and pitch, then compare candidates across metric and inch systems.
Basis for this size
Nominal designation and family transcribed from the live directory on 2026-10-19; unit conversions are calculated using exactly 25.4 mm/in. No matching drill row has been reviewed for this exact size. Paid standard limit tables have not been reviewed.
ISO 261 · metric general plan ↗ · Guhring · Tap Drill Sizes ↗ Full source scope →