M27×3.0 Thread Specifications
Complete dimensions for M27×3.0 coarse pitch thread per ISO 724. Pitch: 3.0mm (8.5 TPI equivalent).
Thread Dimensions
| Designation | M27×3.0 |
| Thread Series | ISO Metric Coarse |
| Pitch | 3.0 mm (8.5 TPI) |
| Major Diameter (d) | 27 mm (1.063") |
| Pitch Diameter (d₂) | 25.0515 mm (0.9863") |
| Minor Diameter — External (d₁) | 23.3193 mm (0.9181") |
| Minor Diameter — Internal (D₁) | 23.7525 mm (0.9351") |
| Thread Depth | 1.6238 mm |
| Tensile Stress Area | 459.41 mm² |
| Fundamental Triangle Height (H) | 2.5981 mm |
Tap Drill Size
Recommended tap drill: 24.0 mm
Calculated minor diameter (D₁): 23.75 mm. Closest standard metric drill: 24.0 mm.
Closest inch drill: 15/16" (0.9375" / 23.81 mm)
Proof Loads by Property Class
| Class | Proof Stress (MPa) | Tensile Strength (MPa) | Proof Load (kN) | Tensile Load (kN) |
|---|---|---|---|---|
| 4.6 | 225 | 400 | 103.4 | 183.8 |
| 4.8 | 310 | 420 | 142.4 | 193.0 |
| 5.8 | 380 | 520 | 174.6 | 238.9 |
| 8.8 | 580 | 800 | 266.5 | 367.5 |
| 9.8 | 650 | 900 | 298.6 | 413.5 |
| 10.9 | 830 | 1040 | 381.3 | 477.8 |
| 12.9 | 970 | 1220 | 445.6 | 560.5 |
Proof load = stress area × proof stress. Per ISO 898-1.
Related Thread Sizes
Common Applications
- Structural steel
- Bridge construction
- Heavy industrial equipment
- Foundation bolts
How M27×3.0 Dimensions Are Calculated
All dimensions on this page are calculated from ISO 724 formulas using the nominal diameter (27 mm) and pitch (3.0 mm):
- Fundamental triangle height: H = (√3/2) × P = 2.5981 mm
- Pitch diameter: d₂ = d − 0.6495 × P = 25.0515 mm
- Minor diameter (external): d₁ = d − 1.2269 × P = 23.3193 mm
- Minor diameter (internal): D₁ = d − 1.0825 × P = 23.7525 mm
- Thread depth: 5H/8 = 1.6238 mm
- Tensile stress area: Aₛ = (π/4) × ((d₂ + d₃)/2)² = 459.41 mm²