M5x0.5 Thread Specs
Standard: ISO 261 (ISO Metric Fine)
This reference guide outlines the technical dimensions and tapping parameters for the standard M5x0.5 metric thread.
Part of the ISO Metric Fine series defined by ISO 261, the thread features a nominal diameter of 5 mm and a pitch of 0.5 mm.
For machining or fabrication, the recommended tap drill size is 4.5 mm (for 75% thread depth) or 4.53 mm (for 65% thread depth).
Dimensional Specifications (mm)
Nominal Diameter
5 mm
Pitch
0.5 mm
Threads per mm
2
Major Diameter
5 mm
Pitch Diameter (d₂)
4.675 mm
Minor Diameter (d₁) Ext
4.459 mm
Minor Diameter (D₁) Int
4.531 mm
Thread Height
0.433 mm
Root Radius
0.072 mm
Drilling & Strength Specs
Tap Drill (75%)
4.5 mm
Tap Drill (65%)
4.53 mm
Stress Area
16.12 mm²
Stress Diameter
4.387 mm
Quick Unit Converter
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Frequently Asked Questions
What is the tap drill size for a M5x0.5 thread?
For standard thread engagement (approx. 75%), the recommended tap drill size for M5x0.5 is 4.5 mm. For a slightly looser 65% thread engagement, a 4.53 mm drill bit is recommended.
What is the pitch of a M5x0.5 thread?
The thread pitch for a standard M5x0.5 thread is 0.5 mm, which equates to approximately 2 threads per millimeter.
What are the major and pitch diameters for M5x0.5?
The nominal major diameter of M5x0.5 is 5 mm. The calculated pitch diameter (d₂) is 4.675 mm per the ISO 68-1/ISO 261 standards.