M7 Thread Specs
Standard: ISO 261 (ISO Metric Coarse)
This reference guide outlines the technical dimensions and tapping parameters for the standard M7 metric thread.
Part of the ISO Metric Coarse series defined by ISO 261, the thread features a nominal diameter of 7 mm and a pitch of 1 mm.
For machining or fabrication, the recommended tap drill size is 6 mm (for 75% thread depth) or 6.06 mm (for 65% thread depth).
Dimensional Specifications (mm)
Nominal Diameter
7 mm
Pitch
1 mm
Threads per mm
1
Major Diameter
7 mm
Pitch Diameter (d₂)
6.35 mm
Minor Diameter (d₁) Ext
5.917 mm
Minor Diameter (D₁) Int
6.062 mm
Thread Height
0.866 mm
Root Radius
0.144 mm
Drilling & Strength Specs
Tap Drill (75%)
6 mm
Tap Drill (65%)
6.06 mm
Stress Area
28.86 mm²
Stress Diameter
5.773 mm
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Frequently Asked Questions
What is the tap drill size for a M7 thread?
For standard thread engagement (approx. 75%), the recommended tap drill size for M7 is 6 mm. For a slightly looser 65% thread engagement, a 6.06 mm drill bit is recommended.
What is the pitch of a M7 thread?
The thread pitch for a standard M7 thread is 1 mm, which equates to approximately 1 threads per millimeter.
What are the major and pitch diameters for M7?
The nominal major diameter of M7 is 7 mm. The calculated pitch diameter (d₂) is 6.35 mm per the ISO 68-1/ISO 261 standards.