11/16-24 UNEF Thread Specifications
Complete dimensions for 11/16-24 UNEF (Unified National Extra Fine) thread per ASME B1.1. TPI: 24, Pitch: 0.04167" (1.058 mm).
Thread Dimensions
| Designation | 11/16-24 UNEF |
| Threads Per Inch (TPI) | 24 |
| Pitch | 0.04167" (1.058 mm) |
| Major Diameter | 0.6875" (17.462 mm) |
| Pitch Diameter | 0.6604" (16.775 mm) |
| Minor Diameter (External) | 0.6364" (16.164 mm) |
| Minor Diameter (Internal) | 0.6424" (16.317 mm) |
| Thread Depth | 0.02255" (0.573 mm) |
| Tensile Stress Area | 0.32868 in² (212.0 mm²) |
Tap Drill Size
Recommended tap drill: 21/32" (0.6562" / 16.67 mm)
Calculated minor diameter (internal): 0.6424" (16.32 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 | 18,077 | 24,322 |
| Grade 5 | 85,000 | 120,000 | 27,938 | 39,441 |
| Grade 8 | 120,000 | 150,000 | 39,441 | 49,302 |
Common Applications
- Precision assemblies
- Thin-wall tubing
- Aerospace fittings