M4×0.7 Thread Specifications
Complete dimensions for M4×0.7 coarse pitch thread per ISO 724. Pitch: 0.7mm (36.3 TPI equivalent).
Thread Dimensions
| Designation | M4×0.7 |
| Thread Series | ISO Metric Coarse |
| Pitch | 0.7 mm (36.3 TPI) |
| Major Diameter (d) | 4 mm (0.1575") |
| Pitch Diameter (d₂) | 3.5454 mm (0.1396") |
| Minor Diameter — External (d₁) | 3.1412 mm (0.1237") |
| Minor Diameter — Internal (D₁) | 3.2423 mm (0.1276") |
| Thread Depth | 0.3789 mm |
| Tensile Stress Area | 8.52 mm² |
| Fundamental Triangle Height (H) | 0.6062 mm |
Tap Drill Size
Recommended tap drill: 3.2 mm
Calculated minor diameter (D₁): 3.24 mm. Closest standard metric drill: 3.2 mm.
Closest inch drill: #30 (0.1285" / 3.26 mm)
Proof Loads by Property Class
| Class | Proof Stress (MPa) | Tensile Strength (MPa) | Proof Load (kN) | Tensile Load (kN) |
|---|---|---|---|---|
| 4.6 | 225 | 400 | 1.9 | 3.4 |
| 4.8 | 310 | 420 | 2.6 | 3.6 |
| 5.8 | 380 | 520 | 3.2 | 4.4 |
| 8.8 | 580 | 800 | 4.9 | 6.8 |
| 9.8 | 650 | 900 | 5.5 | 7.7 |
| 10.9 | 830 | 1040 | 7.1 | 8.9 |
| 12.9 | 970 | 1220 | 8.3 | 10.4 |
Proof load = stress area × proof stress. Per ISO 898-1.
Related Thread Sizes
Common Applications
- Machine screws
- Electronics enclosures
- Light fixtures
- Automotive trim
How M4×0.7 Dimensions Are Calculated
All dimensions on this page are calculated from ISO 724 formulas using the nominal diameter (4 mm) and pitch (0.7 mm):
- Fundamental triangle height: H = (√3/2) × P = 0.6062 mm
- Pitch diameter: d₂ = d − 0.6495 × P = 3.5454 mm
- Minor diameter (external): d₁ = d − 1.2269 × P = 3.1412 mm
- Minor diameter (internal): D₁ = d − 1.0825 × P = 3.2423 mm
- Thread depth: 5H/8 = 0.3789 mm
- Tensile stress area: Aₛ = (π/4) × ((d₂ + d₃)/2)² = 8.52 mm²