1-1/2-6 UNC Thread Specifications
Complete dimensions for 1-1/2-6 UNC (Unified National Coarse) thread per ASME B1.1. TPI: 6, Pitch: 0.16667" (4.233 mm).
Thread Dimensions
| Designation | 1-1/2-6 UNC |
| Threads Per Inch (TPI) | 6 |
| Pitch | 0.16667" (4.233 mm) |
| Major Diameter | 1.5" (38.1 mm) |
| Pitch Diameter | 1.3918" (35.35 mm) |
| Minor Diameter (External) | 1.2955" (32.906 mm) |
| Minor Diameter (Internal) | 1.3196" (33.517 mm) |
| Thread Depth | 0.09021" (2.291 mm) |
| Tensile Stress Area | 1.40525 in² (906.6 mm²) |
Tap Drill Size
Recommended tap drill: 1-5/16" (1.3125" / 33.34 mm)
Calculated minor diameter (internal): 1.3196" (33.52 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 | 77,289 | 103,989 |
| Grade 5 | 85,000 | 120,000 | 119,446 | 168,630 |
| Grade 8 | 120,000 | 150,000 | 168,630 | 210,788 |
Same Size, Different Series
Common Applications
- Heavy structural, foundation bolts, large machinery
- Coarse thread applications