M10 Thread Specs
Standard: ISO 261 (ISO Metric Coarse)
This reference guide outlines the technical dimensions and tapping parameters for the standard M10 metric thread.
Part of the ISO Metric Coarse series defined by ISO 261, the thread features a nominal diameter of 10 mm and a pitch of 1.5 mm.
For machining or fabrication, the recommended tap drill size is 8.5 mm (for 75% thread depth) or 8.59 mm (for 65% thread depth).
Dimensional Specifications (mm)
Nominal Diameter
10 mm
Pitch
1.5 mm
Threads per mm
0.67
Major Diameter
10 mm
Pitch Diameter (d₂)
9.026 mm
Minor Diameter (d₁) Ext
8.376 mm
Minor Diameter (D₁) Int
8.593 mm
Thread Height
1.299 mm
Root Radius
0.217 mm
Drilling & Strength Specs
Tap Drill (75%)
8.5 mm
Tap Drill (65%)
8.59 mm
Stress Area
57.99 mm²
Stress Diameter
8.16 mm
Recommended Tightening Torque
| Property Class | Dry (Nm) | Lubricated (Nm) |
|---|---|---|
| Class 8.8 | 61 | 45.8 |
| Class 10.9 | 90 | 67.5 |
| Class 12.9 | 108 | 81 |
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Frequently Asked Questions
What is the tap drill size for a M10 thread?
For standard thread engagement (approx. 75%), the recommended tap drill size for M10 is 8.5 mm. For a slightly looser 65% thread engagement, a 8.59 mm drill bit is recommended.
What is the pitch of a M10 thread?
The thread pitch for a standard M10 thread is 1.5 mm, which equates to approximately 0.67 threads per millimeter.
What are the major and pitch diameters for M10?
The nominal major diameter of M10 is 10 mm. The calculated pitch diameter (d₂) is 9.026 mm per the ISO 68-1/ISO 261 standards.