Threads / Size reference
M42x4.5 Metric coarse
M42x4.5 has a nominal outside diameter of 42 mm and a 4.5 mm pitch.
1.653543 in
5.644444 TPI · calculated
Nominal dimensions; no class allowances or acceptance limits applied. M sizes state diameter and pitch in millimetres.
same diameter comparison
M42x4.5 vs M42x3
M42x3 Metric fine shares the nominal diameter but has a 3.000000 mm pitch. The pitch difference is 1.500000 mm; these are different nominal threads.
Swipe to compare both sizes →
| Property | M42x4.5 Metric coarse | M42x3 Metric fine |
|---|---|---|
| Nominal diameter · in | 1.653543 | 1.653543 |
| Nominal diameter · mm | 42 | 42 |
| Threads per inchDifferent | 5.644444 | 8.466667 |
| Pitch · mmDifferent | 4.5 | 3 |
Tapping-hole evidence for M42x4.5
No reviewed chart row for M42x4.5 Metric coarse
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 →