M7×0.75 Thread Specifications
Complete dimensions for M7×0.75 fine pitch thread per ISO 724. Pitch: 0.75mm (33.9 TPI equivalent).
Thread Dimensions
| Designation | M7×0.75 |
| Thread Series | ISO Metric Fine |
| Pitch | 0.75 mm (33.9 TPI) |
| Major Diameter (d) | 7 mm (0.2756") |
| Pitch Diameter (d₂) | 6.5129 mm (0.2564") |
| Minor Diameter — External (d₁) | 6.0798 mm (0.2394") |
| Minor Diameter — Internal (D₁) | 6.1881 mm (0.2436") |
| Thread Depth | 0.4059 mm |
| Tensile Stress Area | 31.14 mm² |
| Fundamental Triangle Height (H) | 0.6495 mm |
Tap Drill Size
Recommended tap drill: 6.2 mm
Calculated minor diameter (D₁): 6.19 mm. Closest standard metric drill: 6.2 mm.
Closest inch drill: C (0.242" / 6.15 mm)
Proof Loads by Property Class
| Class | Proof Stress (MPa) | Tensile Strength (MPa) | Proof Load (kN) | Tensile Load (kN) |
|---|---|---|---|---|
| 4.6 | 225 | 400 | 7.0 | 12.5 |
| 4.8 | 310 | 420 | 9.7 | 13.1 |
| 5.8 | 380 | 520 | 11.8 | 16.2 |
| 8.8 | 580 | 800 | 18.1 | 24.9 |
| 9.8 | 650 | 900 | 20.2 | 28.0 |
| 10.9 | 830 | 1040 | 25.8 | 32.4 |
| 12.9 | 970 | 1220 | 30.2 | 38.0 |
Proof load = stress area × proof stress. Per ISO 898-1.
Related Thread Sizes
Common Applications
- Automotive engine components
- Precision machinery
- Vibration-prone joints
- Cylinder head bolts
How M7×0.75 Dimensions Are Calculated
All dimensions on this page are calculated from ISO 724 formulas using the nominal diameter (7 mm) and pitch (0.75 mm):
- Fundamental triangle height: H = (√3/2) × P = 0.6495 mm
- Pitch diameter: d₂ = d − 0.6495 × P = 6.5129 mm
- Minor diameter (external): d₁ = d − 1.2269 × P = 6.0798 mm
- Minor diameter (internal): D₁ = d − 1.0825 × P = 6.1881 mm
- Thread depth: 5H/8 = 0.4059 mm
- Tensile stress area: Aₛ = (π/4) × ((d₂ + d₃)/2)² = 31.14 mm²