Threads / Size reference
M12x1.5 Metric fine
M12x1.5 has a nominal outside diameter of 12 mm and a 1.5 mm pitch.
0.472441 in
16.933333 TPI · calculated
Nominal dimensions; no class allowances or acceptance limits applied. M sizes state diameter and pitch in millimetres.
same diameter comparison
M12x1.5 vs M12x1.75
M12x1.75 Metric coarse shares the nominal diameter but has a 1.750000 mm pitch. The pitch difference is 0.250000 mm; these are different nominal threads.
Swipe to compare both sizes →
| Property | M12x1.5 Metric fine | M12x1.75 Metric coarse |
|---|---|---|
| Nominal diameter · in | 0.472441 | 0.472441 |
| Nominal diameter · mm | 12 | 12 |
| Threads per inchDifferent | 16.933333 | 14.514286 |
| Pitch · mmDifferent | 1.5 | 1.75 |
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 → |
Cutting-tap drill references
| Target theoretical thread | Listed drill | Diameter · in / mm |
|---|---|---|
| 55% | 10.90 mm | 0.429134 / 10.9 |
| 65% | 27/64 in | 0.421875 / 10.715625 |
| 75% | 10.50 mm | 0.413386 / 10.5 |
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. The drill row was read from Guhring PDF page 2; numbered and letter drill diameters use page 1. Paid standard limit tables have not been reviewed.
ISO 261 · metric general plan ↗ · Guhring · Tap Drill Sizes ↗ Full source scope →