Threads / Size reference
M12x1.25 Metric fine
M12x1.25 has a nominal outside diameter of 12 mm and a 1.25 mm pitch.
0.472441 in
20.32 TPI · calculated
Nominal dimensions; no class allowances or acceptance limits applied. M sizes state diameter and pitch in millimetres.
same diameter comparison
M12x1.25 vs M12x1.5
M12x1.5 Metric fine shares the nominal diameter but has a 1.500000 mm pitch. The pitch difference is 0.250000 mm; these are different nominal threads.
Swipe to compare both sizes →
| Property | M12x1.25 Metric fine | M12x1.5 Metric fine |
|---|---|---|
| Nominal diameter · in | 0.472441 | 0.472441 |
| Nominal diameter · mm | 12 | 12 |
| Threads per inchDifferent | 20.32 | 16.933333 |
| Pitch · mmDifferent | 1.25 | 1.5 |
All 3 options at this diameter
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| Designation | Major Ø · in / mm | TPI | Pitch · mm | Drill evidence | Next step |
|---|---|---|---|---|---|
| M12x1.75 Metric coarse | 0.472441 / 12 | 14.514286 converted | 1.75 | Chart row | Tap-drill lookup → |
| M12x1.25 Metric fine | 0.472441 / 12 | 20.32 converted | 1.25 | Equation only | Tap-drill lookup → |
| M12x1.5 Metric fine | 0.472441 / 12 | 16.933333 converted | 1.5 | Chart row | Tap-drill lookup → |
Tapping-hole evidence for M12x1.25
No reviewed chart row for M12x1.25 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 →