M12×1.75 Thread Specifications
Complete dimensions for M12×1.75 coarse pitch thread per ISO 724. Pitch: 1.75mm (14.5 TPI equivalent).
Thread Dimensions
| Designation | M12×1.75 |
| Thread Series | ISO Metric Coarse |
| Pitch | 1.75 mm (14.5 TPI) |
| Major Diameter (d) | 12 mm (0.4724") |
| Pitch Diameter (d₂) | 10.8634 mm (0.4277") |
| Minor Diameter — External (d₁) | 9.8529 mm (0.3879") |
| Minor Diameter — Internal (D₁) | 10.1056 mm (0.3979") |
| Thread Depth | 0.9472 mm |
| Tensile Stress Area | 84.27 mm² |
| Fundamental Triangle Height (H) | 1.5155 mm |
Tap Drill Size
Recommended tap drill: 10.2 mm
Calculated minor diameter (D₁): 10.11 mm. Closest standard metric drill: 10.2 mm.
Closest inch drill: X (0.397" / 10.08 mm)
Proof Loads by Property Class
| Class | Proof Stress (MPa) | Tensile Strength (MPa) | Proof Load (kN) | Tensile Load (kN) |
|---|---|---|---|---|
| 4.6 | 225 | 400 | 19.0 | 33.7 |
| 4.8 | 310 | 420 | 26.1 | 35.4 |
| 5.8 | 380 | 520 | 32.0 | 43.8 |
| 8.8 | 580 | 800 | 48.9 | 67.4 |
| 9.8 | 650 | 900 | 54.8 | 75.8 |
| 10.9 | 830 | 1040 | 69.9 | 87.6 |
| 12.9 | 970 | 1220 | 81.7 | 102.8 |
Proof load = stress area × proof stress. Per ISO 898-1.
Related Thread Sizes
Common Applications
- Heavy machinery
- Structural steel
- Automotive suspension
- Flange bolts
How M12×1.75 Dimensions Are Calculated
All dimensions on this page are calculated from ISO 724 formulas using the nominal diameter (12 mm) and pitch (1.75 mm):
- Fundamental triangle height: H = (√3/2) × P = 1.5155 mm
- Pitch diameter: d₂ = d − 0.6495 × P = 10.8634 mm
- Minor diameter (external): d₁ = d − 1.2269 × P = 9.8529 mm
- Minor diameter (internal): D₁ = d − 1.0825 × P = 10.1056 mm
- Thread depth: 5H/8 = 0.9472 mm
- Tensile stress area: Aₛ = (π/4) × ((d₂ + d₃)/2)² = 84.27 mm²