M36×4.0 Thread Specifications
Complete dimensions for M36×4.0 coarse pitch thread per ISO 724. Pitch: 4.0mm (6.3 TPI equivalent).
Thread Dimensions
| Designation | M36×4.0 |
| Thread Series | ISO Metric Coarse |
| Pitch | 4.0 mm (6.3 TPI) |
| Major Diameter (d) | 36 mm (1.4173") |
| Pitch Diameter (d₂) | 33.402 mm (1.315") |
| Minor Diameter — External (d₁) | 31.0924 mm (1.2241") |
| Minor Diameter — Internal (D₁) | 31.67 mm (1.2469") |
| Thread Depth | 2.1651 mm |
| Tensile Stress Area | 816.72 mm² |
| Fundamental Triangle Height (H) | 3.4641 mm |
Tap Drill Size
Recommended tap drill: 32.0 mm
Calculated minor diameter (D₁): 31.67 mm. Closest standard metric drill: 32.0 mm.
Closest inch drill: 1-1/4" (1.25" / 31.75 mm)
Proof Loads by Property Class
| Class | Proof Stress (MPa) | Tensile Strength (MPa) | Proof Load (kN) | Tensile Load (kN) |
|---|---|---|---|---|
| 4.6 | 225 | 400 | 183.8 | 326.7 |
| 4.8 | 310 | 420 | 253.2 | 343.0 |
| 5.8 | 380 | 520 | 310.4 | 424.7 |
| 8.8 | 580 | 800 | 473.7 | 653.4 |
| 9.8 | 650 | 900 | 530.9 | 735.0 |
| 10.9 | 830 | 1040 | 677.9 | 849.4 |
| 12.9 | 970 | 1220 | 792.2 | 996.4 |
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 M36×4.0 Dimensions Are Calculated
All dimensions on this page are calculated from ISO 724 formulas using the nominal diameter (36 mm) and pitch (4.0 mm):
- Fundamental triangle height: H = (√3/2) × P = 3.4641 mm
- Pitch diameter: d₂ = d − 0.6495 × P = 33.402 mm
- Minor diameter (external): d₁ = d − 1.2269 × P = 31.0924 mm
- Minor diameter (internal): D₁ = d − 1.0825 × P = 31.67 mm
- Thread depth: 5H/8 = 2.1651 mm
- Tensile stress area: Aₛ = (π/4) × ((d₂ + d₃)/2)² = 816.72 mm²