M6×0.75 Thread Specifications
Complete dimensions for M6×0.75 fine pitch thread per ISO 724. Pitch: 0.75mm (33.9 TPI equivalent).
Thread Dimensions
| Designation | M6×0.75 |
| Thread Series | ISO Metric Fine |
| Pitch | 0.75 mm (33.9 TPI) |
| Major Diameter (d) | 6 mm (0.2362") |
| Pitch Diameter (d₂) | 5.5129 mm (0.217") |
| Minor Diameter — External (d₁) | 5.0798 mm (0.2") |
| Minor Diameter — Internal (D₁) | 5.1881 mm (0.2043") |
| Thread Depth | 0.4059 mm |
| Tensile Stress Area | 21.58 mm² |
| Fundamental Triangle Height (H) | 0.6495 mm |
Tap Drill Size
Recommended tap drill: 5.2 mm
Calculated minor diameter (D₁): 5.19 mm. Closest standard metric drill: 5.2 mm.
Closest inch drill: #6 (0.204" / 5.18 mm)
Proof Loads by Property Class
| Class | Proof Stress (MPa) | Tensile Strength (MPa) | Proof Load (kN) | Tensile Load (kN) |
|---|---|---|---|---|
| 4.6 | 225 | 400 | 4.9 | 8.6 |
| 4.8 | 310 | 420 | 6.7 | 9.1 |
| 5.8 | 380 | 520 | 8.2 | 11.2 |
| 8.8 | 580 | 800 | 12.5 | 17.3 |
| 9.8 | 650 | 900 | 14.0 | 19.4 |
| 10.9 | 830 | 1040 | 17.9 | 22.4 |
| 12.9 | 970 | 1220 | 20.9 | 26.3 |
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 M6×0.75 Dimensions Are Calculated
All dimensions on this page are calculated from ISO 724 formulas using the nominal diameter (6 mm) and pitch (0.75 mm):
- Fundamental triangle height: H = (√3/2) × P = 0.6495 mm
- Pitch diameter: d₂ = d − 0.6495 × P = 5.5129 mm
- Minor diameter (external): d₁ = d − 1.2269 × P = 5.0798 mm
- Minor diameter (internal): D₁ = d − 1.0825 × P = 5.1881 mm
- Thread depth: 5H/8 = 0.4059 mm
- Tensile stress area: Aₛ = (π/4) × ((d₂ + d₃)/2)² = 21.58 mm²