7/16-20 UNF Thread Specifications
Complete dimensions for 7/16-20 UNF (Unified National Fine) thread per ASME B1.1. TPI: 20, Pitch: 0.05" (1.27 mm).
Thread Dimensions
| Designation | 7/16-20 UNF |
| Threads Per Inch (TPI) | 20 |
| Pitch | 0.05" (1.27 mm) |
| Major Diameter | 0.4375" (11.112 mm) |
| Pitch Diameter | 0.405" (10.288 mm) |
| Minor Diameter (External) | 0.3762" (9.554 mm) |
| Minor Diameter (Internal) | 0.3834" (9.738 mm) |
| Thread Depth | 0.02706" (0.687 mm) |
| Tensile Stress Area | 0.11872 in² (76.6 mm²) |
Tap Drill Size
Recommended tap drill: W (0.386" / 9.8 mm)
Calculated minor diameter (internal): 0.3834" (9.74 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 | 6,530 | 8,785 |
| Grade 5 | 85,000 | 120,000 | 10,091 | 14,246 |
| Grade 8 | 120,000 | 150,000 | 14,246 | 17,808 |
Same Size, Different Series
Common Applications
- Automotive, heavy-duty brackets, machinery
- Fine thread applications