#2-64 UNF Thread Specifications
Complete dimensions for #2-64 UNF thread per ASME B1.1. TPI: 64, Pitch: 0.01562" (0.397 mm).
Thread Dimensions
| Designation | #2-64 UNF |
| Threads Per Inch (TPI) | 64 |
| Pitch | 0.01562" (0.397 mm) |
| Major Diameter | 0.086" (2.184 mm) |
| Pitch Diameter | 0.0759" (1.927 mm) |
| Minor Diameter (External) | 0.0668" (1.697 mm) |
| Minor Diameter (Internal) | 0.0691" (1.755 mm) |
| Thread Depth | 0.00846" (0.215 mm) |
| Tensile Stress Area | 0.00387 in² (2.5 mm²) |
Tap Drill Size
Recommended tap drill: #50 (0.07" / 1.78 mm)
Calculated minor diameter (internal): 0.0691" (1.75 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 | 213 | 286 |
| Grade 5 | 85,000 | 120,000 | 329 | 464 |
| Grade 8 | 120,000 | 150,000 | 464 | 580 |
Same Size, Different Series
Common Applications
- Electronics
- Instrument screws
- Precision assemblies
- Avionics