thread-dat
- The "Rule of Three" Threads
For a secure connection in engineering, it is standard practice to have at least 3 full thread rotations engaged.
If the pitch is 1.0mm: You need a minimum of 3.0mm thickness.
If the pitch is 0.75mm: You need a minimum of 2.25mm thickness.
thread pitch
For a 17mm mounting plate, 1.0mm (Fine Pitch) is the superior choice over 2.0mm.
| Feature | 1.0mm (Fine) | 2.0mm (Coarse) |
|---|---|---|
| Thread Engagement | High (3-5 threads in a 4mm plate) | Low (1-2 threads in a 4mm plate) |
| Security | Better resistance to vibration | Higher risk of stripping |
| Compatibility | Standard for mobile optics | Non-standard for this size |
via custom script - internal thread
counterbore VS countersink
Metric & Imperial Systems
| Standard | Name | Angle | Region |
|---|---|---|---|
| ISO Metric | Metric Thread (M) | 60° | Worldwide |
| Unified | UNC / UNF / UNEF | 60° | USA |
| Whitworth | BSW / BSP | 55° | UK |
| Pipe Thread | NPT / BSPP / BSPT | 60° / 55° | Piping |
3️⃣ Metric Thread Details (ISO)
| Property | Description |
|---|---|
| Designation | M6 × 1.0 |
| Major Diameter | Nominal outer diameter |
| Pitch | Distance between threads |
| Thread Angle | 60° |
| Direction | Right-hand / Left-hand |
Common Metric Threads
| Size | Pitch (mm) |
|---|---|
| M3 | 0.5 |
| M4 | 0.7 |
| M5 | 0.8 |
| M6 | 1.0 |
| M8 | 1.25 |