M64×6.0 Thread Specifications
Complete dimensions for M64×6.0 coarse pitch thread per ISO 724. Pitch: 6.0mm (4.2 TPI equivalent).
Thread Dimensions
| Designation | M64×6.0 |
| Thread Series | ISO Metric Coarse |
| Pitch | 6.0 mm (4.2 TPI) |
| Major Diameter (d) | 64 mm (2.5197") |
| Pitch Diameter (d₂) | 60.103 mm (2.3663") |
| Minor Diameter — External (d₁) | 56.6386 mm (2.2299") |
| Minor Diameter — Internal (D₁) | 57.505 mm (2.264") |
| Thread Depth | 3.2476 mm |
| Tensile Stress Area | 2675.97 mm² |
| Fundamental Triangle Height (H) | 5.1962 mm |
Tap Drill Size
Recommended tap drill: 58.0 mm
Calculated minor diameter (D₁): 57.51 mm. Closest standard metric drill: 58.0 mm.
Closest inch drill: 2-17/64" (2.2656" / 57.55 mm)
Proof Loads by Property Class
| Class | Proof Stress (MPa) | Tensile Strength (MPa) | Proof Load (kN) | Tensile Load (kN) |
|---|---|---|---|---|
| 4.6 | 225 | 400 | 602.1 | 1070.4 |
| 4.8 | 310 | 420 | 829.6 | 1123.9 |
| 5.8 | 380 | 520 | 1016.9 | 1391.5 |
| 8.8 | 580 | 800 | 1552.1 | 2140.8 |
| 9.8 | 650 | 900 | 1739.4 | 2408.4 |
| 10.9 | 830 | 1040 | 2221.1 | 2783.0 |
| 12.9 | 970 | 1220 | 2595.7 | 3264.7 |
Proof load = stress area × proof stress. Per ISO 898-1.
Common Applications
- Structural steel
- Bridge construction
- Heavy industrial equipment
- Foundation bolts
How M64×6.0 Dimensions Are Calculated
All dimensions on this page are calculated from ISO 724 formulas using the nominal diameter (64 mm) and pitch (6.0 mm):
- Fundamental triangle height: H = (√3/2) × P = 5.1962 mm
- Pitch diameter: d₂ = d − 0.6495 × P = 60.103 mm
- Minor diameter (external): d₁ = d − 1.2269 × P = 56.6386 mm
- Minor diameter (internal): D₁ = d − 1.0825 × P = 57.505 mm
- Thread depth: 5H/8 = 3.2476 mm
- Tensile stress area: Aₛ = (π/4) × ((d₂ + d₃)/2)² = 2675.97 mm²