#0-80 UNF Thread Specifications
Complete dimensions for #0-80 UNF (Unified National Fine) thread per ASME B1.1. TPI: 80, Pitch: 0.0125" (0.318 mm).
Thread Dimensions
| Designation | #0-80 UNF |
| Threads Per Inch (TPI) | 80 |
| Pitch | 0.0125" (0.318 mm) |
| Major Diameter | 0.06" (1.524 mm) |
| Pitch Diameter | 0.0519" (1.318 mm) |
| Minor Diameter (External) | 0.0447" (1.134 mm) |
| Minor Diameter (Internal) | 0.0465" (1.18 mm) |
| Thread Depth | 0.00677" (0.172 mm) |
| Tensile Stress Area | 0.00180 in² (1.2 mm²) |
Tap Drill Size
Recommended tap drill: #56 (0.0465" / 1.18 mm)
Calculated minor diameter (internal): 0.0465" (1.18 mm)
Proof Loads by SAE Grade
| Grade | Proof Stress (psi) | Tensile Strength (psi) | Proof Load (lbf) | Tensile Load (lbf) |
|---|---|---|---|---|
| Grade 2 | 55,000 | 74,000 | 99 | 133 |
| Grade 5 | 85,000 | 120,000 | 153 | 216 |
| Grade 8 | 120,000 | 150,000 | 216 | 270 |
Common Applications
- Electronics
- Instrument screws
- Precision assemblies
- Avionics