#12-32 UNEF Thread Specifications
Complete dimensions for #12-32 UNEF (Unified National Extra Fine) thread per ASME B1.1. TPI: 32, Pitch: 0.03125" (0.794 mm).
Thread Dimensions
| Designation | #12-32 UNEF |
| Threads Per Inch (TPI) | 32 |
| Pitch | 0.03125" (0.794 mm) |
| Major Diameter | 0.216" (5.486 mm) |
| Pitch Diameter | 0.1957" (4.971 mm) |
| Minor Diameter (External) | 0.1777" (4.513 mm) |
| Minor Diameter (Internal) | 0.1822" (4.627 mm) |
| Thread Depth | 0.01691" (0.43 mm) |
| Tensile Stress Area | 0.02704 in² (17.4 mm²) |
Tap Drill Size
Recommended tap drill: #14 (0.182" / 4.62 mm)
Calculated minor diameter (internal): 0.1822" (4.63 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 | 1,487 | 2,001 |
| Grade 5 | 85,000 | 120,000 | 2,298 | 3,245 |
| Grade 8 | 120,000 | 150,000 | 3,245 | 4,056 |
Same Size, Different Series
Common Applications
- Precision assemblies
- Thin-wall tubing
- Aerospace fittings