1-3/4-5 UNC Thread Specifications
Complete dimensions for 1-3/4-5 UNC (Unified National Coarse) thread per ASME B1.1. TPI: 5, Pitch: 0.2" (5.08 mm).
Thread Dimensions
| Designation | 1-3/4-5 UNC |
| Threads Per Inch (TPI) | 5 |
| Pitch | 0.2" (5.08 mm) |
| Major Diameter | 1.75" (44.45 mm) |
| Pitch Diameter | 1.6201" (41.151 mm) |
| Minor Diameter (External) | 1.5046" (38.217 mm) |
| Minor Diameter (Internal) | 1.5335" (38.951 mm) |
| Thread Depth | 0.10825" (2.75 mm) |
| Tensile Stress Area | 1.89946 in² (1225.5 mm²) |
Tap Drill Size
Recommended tap drill: 1-17/32" (1.5312" / 38.89 mm)
Calculated minor diameter (internal): 1.5335" (38.95 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 | 104,470 | 140,560 |
| Grade 5 | 85,000 | 120,000 | 161,454 | 227,935 |
| Grade 8 | 120,000 | 150,000 | 227,935 | 284,919 |
Common Applications
- Heavy structural, foundation bolts, large machinery
- Coarse thread applications