Threads / Size reference
M2.5x0.45 Metric coarse
M2.5x0.45 has a nominal outside diameter of 2.5 mm and a 0.45 mm pitch.
0.098425 in
56.444444 TPI · calculated
Nominal dimensions; no class allowances or acceptance limits applied. M sizes state diameter and pitch in millimetres.
nearby diameter comparison
M2.5x0.45 vs M2x0.4
There is no second pitch at this diameter in the directory. Compare the nearby M2x0.4 Metric coarse: its nominal diameter differs by 0.5 mm. It is not a replacement.
Swipe to compare both sizes →
| Property | M2.5x0.45 Metric coarse | M2x0.4 Metric coarse |
|---|---|---|
| Nominal diameter · inDifferent | 0.098425 | 0.07874 |
| Nominal diameter · mmDifferent | 2.5 | 2 |
| Threads per inchDifferent | 56.444444 | 63.5 |
| Pitch · mmDifferent | 0.45 | 0.4 |
Cutting-tap drill references
| Target theoretical thread | Listed drill | Diameter · in / mm |
|---|---|---|
| 55% | #44 | 0.086 / 2.1844 |
| 65% | 2.10 mm | 0.082677 / 2.1 |
| 75% | #46 | 0.081 / 2.0574 |
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 →