Threads / Size reference
M8x1 Metric fine
M8x1 has a nominal outside diameter of 8 mm and a 1 mm pitch.
0.314961 in
25.4 TPI · calculated
Nominal dimensions; no class allowances or acceptance limits applied. M sizes state diameter and pitch in millimetres.
same diameter comparison
M8x1 vs M8x1.25
M8x1.25 Metric coarse shares the nominal diameter but has a 1.250000 mm pitch. The pitch difference is 0.250000 mm; these are different nominal threads.
Swipe to compare both sizes →
| Property | M8x1 Metric fine | M8x1.25 Metric coarse |
|---|---|---|
| Nominal diameter · in | 0.314961 | 0.314961 |
| Nominal diameter · mm | 8 | 8 |
| Threads per inchDifferent | 25.4 | 20.32 |
| Pitch · mmDifferent | 1 | 1.25 |
Cutting-tap drill references
| Target theoretical thread | Listed drill | Diameter · in / mm |
|---|---|---|
| 55% | 7.25 mm | 0.285433 / 7.25 |
| 65% | 9/32 in | 0.28125 / 7.14375 |
| 75% | 7.00 mm | 0.275591 / 7 |
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 →