3/8-32 UNEF Thread Specifications
Complete dimensions for 3/8-32 UNEF thread per ASME B1.1. TPI: 32, Pitch: 0.03125" (0.794 mm).
Thread Dimensions
| Designation | 3/8-32 UNEF |
| Threads Per Inch (TPI) | 32 |
| Pitch | 0.03125" (0.794 mm) |
| Major Diameter | 0.375" (9.525 mm) |
| Pitch Diameter | 0.3547" (9.009 mm) |
| Minor Diameter (External) | 0.3367" (8.551 mm) |
| Minor Diameter (Internal) | 0.3412" (8.666 mm) |
| Thread Depth | 0.01691" (0.43 mm) |
| Tensile Stress Area | 0.09263 in² (59.8 mm²) |
Tap Drill Size
Recommended tap drill: R (0.339" / 8.61 mm)
Calculated minor diameter (internal): 0.3412" (8.67 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 | 5,095 | 6,855 |
| Grade 5 | 85,000 | 120,000 | 7,874 | 11,116 |
| Grade 8 | 120,000 | 150,000 | 11,116 | 13,894 |
Same Size, Different Series
Common Applications
- Precision assemblies
- Thin-wall tubing
- Aerospace fittings