5/8-11 UNC Thread Specifications
Complete dimensions for 5/8-11 UNC (Unified National Coarse) thread per ASME B1.1. TPI: 11, Pitch: 0.09091" (2.309 mm).
Thread Dimensions
| Designation | 5/8-11 UNC |
| Threads Per Inch (TPI) | 11 |
| Pitch | 0.09091" (2.309 mm) |
| Major Diameter | 0.625" (15.875 mm) |
| Pitch Diameter | 0.566" (14.375 mm) |
| Minor Diameter (External) | 0.5135" (13.042 mm) |
| Minor Diameter (Internal) | 0.5266" (13.375 mm) |
| Thread Depth | 0.04921" (1.25 mm) |
| Tensile Stress Area | 0.22600 in² (145.8 mm²) |
Tap Drill Size
Recommended tap drill: 17/32" (0.5312" / 13.49 mm)
Calculated minor diameter (internal): 0.5266" (13.38 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 | 12,430 | 16,724 |
| Grade 5 | 85,000 | 120,000 | 19,210 | 27,120 |
| Grade 8 | 120,000 | 150,000 | 27,120 | 33,900 |
Same Size, Different Series
Common Applications
- Structural connections, heavy equipment, flanges
- Coarse thread applications