Threads / Size reference

M10x1.5 Metric coarse

M10x1.5 has a nominal outside diameter of 10 mm and a 1.5 mm pitch.

Nominal major diameter10 mm

0.393701 in

Pitch1.5 mm

16.933333 TPI · calculated

Check tap-drill options →Compare M10x1.25 →

Nominal dimensions; no class allowances or acceptance limits applied. M sizes state diameter and pitch in millimetres.

M10x1.5 · PITCH VIEWSCHEMATIC

same diameter comparison

M10x1.5 vs M10x1.25

M10x1.25 Metric fine 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 →

Nominal size comparison
Property	M10x1.5 Metric coarse	M10x1.25 Metric fine
Nominal diameter · in	0.393701	0.393701
Nominal diameter · mm	10	10
Threads per inchDifferent	16.933333	20.32
Pitch · mmDifferent	1.5	1.25

All 3 options at this diameter

Swipe to see all columns →

Nominal thread sizes in this reference
Designation	Major Ø · in / mm	TPI	Pitch · mm	Drill evidence	Next step
M10x1.5 Metric coarse	0.393701 / 10	16.933333 converted	1.5	Chart row	Tap-drill lookup →
M10x1 Metric fine	0.393701 / 10	25.4 converted	1	Chart row	Tap-drill lookup →
M10x1.25 Metric fine	0.393701 / 10	20.32 converted	1.25	Chart row	Tap-drill lookup →

Browse Metric coarse →

Source chart available

Cutting-tap drill references

Cut taps · Guhring chart · PDF page 2
Target theoretical thread	Listed drill	Diameter · in / mm
55%	8.90 mm	0.350394 / 8.9
65%	11/32 in	0.34375 / 8.73125
75%	8.50 mm	0.334646 / 8.5

Choose cut / form and target →

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 →