#6-32 UNC Thread Specifications
Complete dimensions for #6-32 UNC (Unified National Coarse) thread per ASME B1.1. TPI: 32, Pitch: 0.03125" (0.794 mm).
Thread Dimensions
| Designation | #6-32 UNC |
| Threads Per Inch (TPI) | 32 |
| Pitch | 0.03125" (0.794 mm) |
| Major Diameter | 0.138" (3.505 mm) |
| Pitch Diameter | 0.1177" (2.99 mm) |
| Minor Diameter (External) | 0.0997" (2.531 mm) |
| Minor Diameter (Internal) | 0.1042" (2.646 mm) |
| Thread Depth | 0.01691" (0.43 mm) |
| Tensile Stress Area | 0.00909 in² (5.9 mm²) |
Tap Drill Size
Recommended tap drill: #37 (0.104" / 2.64 mm)
Calculated minor diameter (internal): 0.1042" (2.65 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 | 500 | 673 |
| Grade 5 | 85,000 | 120,000 | 773 | 1,091 |
| Grade 8 | 120,000 | 150,000 | 1,091 | 1,364 |
Same Size, Different Series
Common Applications
- Machine screws
- Electrical covers
- Small appliances
- Sheet metal