M27×1.0 Thread Specifications
Complete dimensions for M27×1.0 fine pitch thread per ISO 724. Pitch: 1.0mm (25.4 TPI equivalent).
Thread Dimensions
| Designation | M27×1.0 |
| Thread Series | ISO Metric Fine |
| Pitch | 1.0 mm (25.4 TPI) |
| Major Diameter (d) | 27 mm (1.063") |
| Pitch Diameter (d₂) | 26.3505 mm (1.0374") |
| Minor Diameter — External (d₁) | 25.7731 mm (1.0147") |
| Minor Diameter — Internal (D₁) | 25.9175 mm (1.0204") |
| Thread Depth | 0.5413 mm |
| Tensile Stress Area | 533.46 mm² |
| Fundamental Triangle Height (H) | 0.866 mm |
Tap Drill Size
Recommended tap drill: 26.0 mm
Calculated minor diameter (D₁): 25.92 mm. Closest standard metric drill: 26.0 mm.
Closest inch drill: 1-1/64" (1.0156" / 25.8 mm)
Proof Loads by Property Class
| Class | Proof Stress (MPa) | Tensile Strength (MPa) | Proof Load (kN) | Tensile Load (kN) |
|---|---|---|---|---|
| 4.6 | 225 | 400 | 120.0 | 213.4 |
| 4.8 | 310 | 420 | 165.4 | 224.1 |
| 5.8 | 380 | 520 | 202.7 | 277.4 |
| 8.8 | 580 | 800 | 309.4 | 426.8 |
| 9.8 | 650 | 900 | 346.7 | 480.1 |
| 10.9 | 830 | 1040 | 442.8 | 554.8 |
| 12.9 | 970 | 1220 | 517.5 | 650.8 |
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 M27×1.0 Dimensions Are Calculated
All dimensions on this page are calculated from ISO 724 formulas using the nominal diameter (27 mm) and pitch (1.0 mm):
- Fundamental triangle height: H = (√3/2) × P = 0.866 mm
- Pitch diameter: d₂ = d − 0.6495 × P = 26.3505 mm
- Minor diameter (external): d₁ = d − 1.2269 × P = 25.7731 mm
- Minor diameter (internal): D₁ = d − 1.0825 × P = 25.9175 mm
- Thread depth: 5H/8 = 0.5413 mm
- Tensile stress area: Aₛ = (π/4) × ((d₂ + d₃)/2)² = 533.46 mm²