M60×5.5 Thread Specifications
Complete dimensions for M60×5.5 coarse pitch thread per ISO 724. Pitch: 5.5mm (4.6 TPI equivalent).
Thread Dimensions
| Designation | M60×5.5 |
| Thread Series | ISO Metric Coarse |
| Pitch | 5.5 mm (4.6 TPI) |
| Major Diameter (d) | 60 mm (2.3622") |
| Pitch Diameter (d₂) | 56.4278 mm (2.2216") |
| Minor Diameter — External (d₁) | 53.252 mm (2.0965") |
| Minor Diameter — Internal (D₁) | 54.0463 mm (2.1278") |
| Thread Depth | 2.977 mm |
| Tensile Stress Area | 2327.95 mm² |
| Fundamental Triangle Height (H) | 4.7631 mm |
Tap Drill Size
Recommended tap drill: 55.0 mm
Calculated minor diameter (D₁): 54.05 mm. Closest standard metric drill: 55.0 mm.
Closest inch drill: 1/1" (1.0" / 25.4 mm)
Proof Loads by Property Class
| Class | Proof Stress (MPa) | Tensile Strength (MPa) | Proof Load (kN) | Tensile Load (kN) |
|---|---|---|---|---|
| 4.6 | 225 | 400 | 523.8 | 931.2 |
| 4.8 | 310 | 420 | 721.7 | 977.7 |
| 5.8 | 380 | 520 | 884.6 | 1210.5 |
| 8.8 | 580 | 800 | 1350.2 | 1862.4 |
| 9.8 | 650 | 900 | 1513.2 | 2095.2 |
| 10.9 | 830 | 1040 | 1932.2 | 2421.1 |
| 12.9 | 970 | 1220 | 2258.1 | 2840.1 |
Proof load = stress area × proof stress. Per ISO 898-1.
Common Applications
- Structural steel
- Bridge construction
- Heavy industrial equipment
- Foundation bolts
How M60×5.5 Dimensions Are Calculated
All dimensions on this page are calculated from ISO 724 formulas using the nominal diameter (60 mm) and pitch (5.5 mm):
- Fundamental triangle height: H = (√3/2) × P = 4.7631 mm
- Pitch diameter: d₂ = d − 0.6495 × P = 56.4278 mm
- Minor diameter (external): d₁ = d − 1.2269 × P = 53.252 mm
- Minor diameter (internal): D₁ = d − 1.0825 × P = 54.0463 mm
- Thread depth: 5H/8 = 2.977 mm
- Tensile stress area: Aₛ = (π/4) × ((d₂ + d₃)/2)² = 2327.95 mm²