M24×3.0 Thread Specifications
Complete dimensions for M24×3.0 coarse pitch thread per ISO 724. Pitch: 3.0mm (8.5 TPI equivalent).
Thread Dimensions
| Designation | M24×3.0 |
| Thread Series | ISO Metric Coarse |
| Pitch | 3.0 mm (8.5 TPI) |
| Major Diameter (d) | 24 mm (0.9449") |
| Pitch Diameter (d₂) | 22.0515 mm (0.8682") |
| Minor Diameter — External (d₁) | 20.3193 mm (0.8") |
| Minor Diameter — Internal (D₁) | 20.7525 mm (0.817") |
| Thread Depth | 1.6238 mm |
| Tensile Stress Area | 352.5 mm² |
| Fundamental Triangle Height (H) | 2.5981 mm |
Tap Drill Size
Recommended tap drill: 20.5 mm
Calculated minor diameter (D₁): 20.75 mm. Closest standard metric drill: 20.5 mm.
Closest inch drill: 13/16" (0.8125" / 20.64 mm)
Proof Loads by Property Class
| Class | Proof Stress (MPa) | Tensile Strength (MPa) | Proof Load (kN) | Tensile Load (kN) |
|---|---|---|---|---|
| 4.6 | 225 | 400 | 79.3 | 141.0 |
| 4.8 | 310 | 420 | 109.3 | 148.1 |
| 5.8 | 380 | 520 | 133.9 | 183.3 |
| 8.8 | 580 | 800 | 204.4 | 282.0 |
| 9.8 | 650 | 900 | 229.1 | 317.2 |
| 10.9 | 830 | 1040 | 292.6 | 366.6 |
| 12.9 | 970 | 1220 | 341.9 | 430.1 |
Proof load = stress area × proof stress. Per ISO 898-1.
Related Thread Sizes
Common Applications
- Structural connections
- Heavy equipment
- Pressure vessels
- Large flanges
How M24×3.0 Dimensions Are Calculated
All dimensions on this page are calculated from ISO 724 formulas using the nominal diameter (24 mm) and pitch (3.0 mm):
- Fundamental triangle height: H = (√3/2) × P = 2.5981 mm
- Pitch diameter: d₂ = d − 0.6495 × P = 22.0515 mm
- Minor diameter (external): d₁ = d − 1.2269 × P = 20.3193 mm
- Minor diameter (internal): D₁ = d − 1.0825 × P = 20.7525 mm
- Thread depth: 5H/8 = 1.6238 mm
- Tensile stress area: Aₛ = (π/4) × ((d₂ + d₃)/2)² = 352.5 mm²