#3-48 UNC Thread Specifications
Complete dimensions for #3-48 UNC thread per ASME B1.1. TPI: 48, Pitch: 0.02083" (0.529 mm).
Thread Dimensions
| Designation | #3-48 UNC |
| Threads Per Inch (TPI) | 48 |
| Pitch | 0.02083" (0.529 mm) |
| Major Diameter | 0.099" (2.515 mm) |
| Pitch Diameter | 0.0855" (2.171 mm) |
| Minor Diameter (External) | 0.0734" (1.865 mm) |
| Minor Diameter (Internal) | 0.0764" (1.942 mm) |
| Thread Depth | 0.01128" (0.286 mm) |
| Tensile Stress Area | 0.00477 in² (3.1 mm²) |
Tap Drill Size
Recommended tap drill: #48 (0.076" / 1.93 mm)
Calculated minor diameter (internal): 0.0764" (1.94 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 | 262 | 353 |
| Grade 5 | 85,000 | 120,000 | 405 | 572 |
| Grade 8 | 120,000 | 150,000 | 572 | 716 |
Same Size, Different Series
Common Applications
- Machine screws
- Electrical covers
- Small appliances
- Sheet metal