M5×0.5 Thread Specifications
Complete dimensions for M5×0.5 fine pitch thread per ISO 724. Pitch: 0.5mm (50.8 TPI equivalent).
Thread Dimensions
| Designation | M5×0.5 |
| Thread Series | ISO Metric Fine |
| Pitch | 0.5 mm (50.8 TPI) |
| Major Diameter (d) | 5 mm (0.1969") |
| Pitch Diameter (d₂) | 4.6753 mm (0.1841") |
| Minor Diameter — External (d₁) | 4.3865 mm (0.1727") |
| Minor Diameter — Internal (D₁) | 4.4588 mm (0.1755") |
| Thread Depth | 0.2706 mm |
| Tensile Stress Area | 15.87 mm² |
| Fundamental Triangle Height (H) | 0.433 mm |
Tap Drill Size
Recommended tap drill: 4.5 mm
Calculated minor diameter (D₁): 4.46 mm. Closest standard metric drill: 4.5 mm.
Closest inch drill: #16 (0.177" / 4.5 mm)
Proof Loads by Property Class
| Class | Proof Stress (MPa) | Tensile Strength (MPa) | Proof Load (kN) | Tensile Load (kN) |
|---|---|---|---|---|
| 4.6 | 225 | 400 | 3.6 | 6.3 |
| 4.8 | 310 | 420 | 4.9 | 6.7 |
| 5.8 | 380 | 520 | 6.0 | 8.3 |
| 8.8 | 580 | 800 | 9.2 | 12.7 |
| 9.8 | 650 | 900 | 10.3 | 14.3 |
| 10.9 | 830 | 1040 | 13.2 | 16.5 |
| 12.9 | 970 | 1220 | 15.4 | 19.4 |
Proof load = stress area × proof stress. Per ISO 898-1.
Related Thread Sizes
Common Applications
- Precision instruments
- Optical equipment
- Aerospace fasteners
- Vibration-resistant assemblies
How M5×0.5 Dimensions Are Calculated
All dimensions on this page are calculated from ISO 724 formulas using the nominal diameter (5 mm) and pitch (0.5 mm):
- Fundamental triangle height: H = (√3/2) × P = 0.433 mm
- Pitch diameter: d₂ = d − 0.6495 × P = 4.6753 mm
- Minor diameter (external): d₁ = d − 1.2269 × P = 4.3865 mm
- Minor diameter (internal): D₁ = d − 1.0825 × P = 4.4588 mm
- Thread depth: 5H/8 = 0.2706 mm
- Tensile stress area: Aₛ = (π/4) × ((d₂ + d₃)/2)² = 15.87 mm²