M3.5×0.6 Thread Specifications
Complete dimensions for M3.5×0.6 coarse pitch thread per ISO 724. Pitch: 0.6mm (42.3 TPI equivalent).
Thread Dimensions
| Designation | M3.5×0.6 |
| Thread Series | ISO Metric Coarse |
| Pitch | 0.6 mm (42.3 TPI) |
| Major Diameter (d) | 3.5 mm (0.1378") |
| Pitch Diameter (d₂) | 3.1103 mm (0.1225") |
| Minor Diameter — External (d₁) | 2.7639 mm (0.1088") |
| Minor Diameter — Internal (D₁) | 2.8505 mm (0.1122") |
| Thread Depth | 0.3248 mm |
| Tensile Stress Area | 6.58 mm² |
| Fundamental Triangle Height (H) | 0.5196 mm |
Tap Drill Size
Recommended tap drill: 2.9 mm
Calculated minor diameter (D₁): 2.85 mm. Closest standard metric drill: 2.9 mm.
Closest inch drill: #33 (0.113" / 2.87 mm)
Proof Loads by Property Class
| Class | Proof Stress (MPa) | Tensile Strength (MPa) | Proof Load (kN) | Tensile Load (kN) |
|---|---|---|---|---|
| 4.6 | 225 | 400 | 1.5 | 2.6 |
| 4.8 | 310 | 420 | 2.0 | 2.8 |
| 5.8 | 380 | 520 | 2.5 | 3.4 |
| 8.8 | 580 | 800 | 3.8 | 5.3 |
| 9.8 | 650 | 900 | 4.3 | 5.9 |
| 10.9 | 830 | 1040 | 5.5 | 6.8 |
| 12.9 | 970 | 1220 | 6.4 | 8.0 |
Proof load = stress area × proof stress. Per ISO 898-1.
Common Applications
- Machine screws
- Electronics enclosures
- Light fixtures
- Automotive trim
How M3.5×0.6 Dimensions Are Calculated
All dimensions on this page are calculated from ISO 724 formulas using the nominal diameter (3.5 mm) and pitch (0.6 mm):
- Fundamental triangle height: H = (√3/2) × P = 0.5196 mm
- Pitch diameter: d₂ = d − 0.6495 × P = 3.1103 mm
- Minor diameter (external): d₁ = d − 1.2269 × P = 2.7639 mm
- Minor diameter (internal): D₁ = d − 1.0825 × P = 2.8505 mm
- Thread depth: 5H/8 = 0.3248 mm
- Tensile stress area: Aₛ = (π/4) × ((d₂ + d₃)/2)² = 6.58 mm²