M3 Bolt Dimensions – Standard Sizes and Specifications
M3 bolts are commonly used in electronics, precision machinery, and small mechanical assemblies due to their compact size and reliable fastening properties. Choosing the right M3 bolt dimensions ensures a secure and stable connection.
Standard Dimensions for M3 Bolts
| Specification | M3 Bolt Dimensions |
|---|---|
| Nominal Diameter (d) | 3 mm |
| Thread Pitch (Standard) | 0.5 mm |
| Thread Pitch (Fine) | 0.35 mm |
| Hex Head Size (Across Flats) | 5.5 mm |
| Hex Head Height | 2 mm |
| Socket Head Diameter | 5 mm |
| Socket Head Height | 3 mm |
Drill and Hole Sizes for M3 Bolts
| Type | Recommended Hole Size |
|---|---|
| Clearance Hole (Normal Fit) | 3.4 mm |
| Clearance Hole (Tight Fit) | 3.2 mm |
| Tapped Hole (Threaded) | 2.5 mm (for M3 x 0.5 thread) |
Common Materials for M3 Bolts
- Stainless Steel – Corrosion-resistant for long-lasting applications.
- Titanium – Lightweight and strong, ideal for aerospace and medical uses.
- Brass – Conductive and corrosion-resistant, used in electronics.
Typical Applications of M3 Bolts
- Electronics – Securing circuit boards and enclosures.
- Precision Machinery – Small mechanical assemblies.
- 3D Printing & Robotics – Mounting components securely.
Using the correct M3 bolt dimensions ensures secure, precise, and reliable fastening in various applications. Always match the thread pitch and hole size for optimal performance.
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