#1-72 UNF Thread Specifications
Complete dimensions for #1-72 UNF (Unified National Fine) thread per ASME B1.1. TPI: 72, Pitch: 0.01389" (0.353 mm).
Thread Dimensions
| Designation | #1-72 UNF |
| Threads Per Inch (TPI) | 72 |
| Pitch | 0.01389" (0.353 mm) |
| Major Diameter | 0.073" (1.854 mm) |
| Pitch Diameter | 0.064" (1.625 mm) |
| Minor Diameter (External) | 0.056" (1.421 mm) |
| Minor Diameter (Internal) | 0.058" (1.472 mm) |
| Thread Depth | 0.00752" (0.191 mm) |
| Tensile Stress Area | 0.00278 in² (1.8 mm²) |
Tap Drill Size
Recommended tap drill: #53 (0.0595" / 1.51 mm)
Calculated minor diameter (internal): 0.058" (1.47 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 | 153 | 206 |
| Grade 5 | 85,000 | 120,000 | 236 | 334 |
| Grade 8 | 120,000 | 150,000 | 334 | 417 |
Same Size, Different Series
Common Applications
- Electronics
- Instrument screws
- Precision assemblies
- Avionics