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What Are Cap Nuts?
Cap nuts, also known as acorn nuts or crown nuts, are specialized fasteners widely used in various mechanical and construction applications. Their unique dome-shaped cap provides a finished appearance and crucial safety benefits by covering exposed threads. This prevents potential injuries from sharp edges and protects threads from damage, dust, and corrosion.
Key Features and Benefits
- Aesthetic Finish: The domed cap gives a smooth, professional look, ideal for visible parts of assemblies.
- Safety: Covers sharp thread ends, reducing the risk of cuts and snags.
- Thread Protection: Shields threads from environmental factors like moisture, dirt, and chemicals, extending the lifespan of the fastener assembly.
- Vibration Resistance: When properly torqued, cap nuts can help maintain clamp load under vibrational stresses.
- Versatility: Available in various materials, sizes, and finishes to suit different industrial needs.
Detailed Product Specifications
Our range of cap nuts is manufactured to the highest industry standards, ensuring reliability and performance. Below are the detailed specifications for our standard product line.
Material Specifications
| Material Grade | Standard | Tensile Strength (min) | Surface Finish | Common Applications |
|---|---|---|---|---|
| Stainless Steel 304 | AISI 304 | 75,000 psi | Plain, Passivated | Marine, Food Processing, Architectural |
| Stainless Steel 316 | AISI 316 | 80,000 psi | Plain, Passivated | Chemical Processing, High Corrosion Environments |
| Carbon Steel, Grade 5 | ASTM A563 | 120,000 psi | Zinc Plated, HDG | General Machinery, Automotive |
| Carbon Steel, Grade 8 | ASTM A563 | 150,000 psi | Zinc Plated, HDG | Heavy-Duty Equipment, High-Stress Applications |
| Brass | ASTM B16 | 45,000 psi | Natural, Chrome Plated | Plumbing, Decorative Hardware, Electrical |
| Aluminum 6061 | ASTM B211 | 18,000 psi | Anodized (Clear/Color) | Aerospace, Weight-Sensitive Applications |
Dimensional Specifications (Inch Series - UNC/UNF)
| Nominal Size | Threads per Inch | Width Across Flats (A/F) | Height (Approx.) | Proof Load (lbs) - Grade 5 Carbon Steel |
|---|---|---|---|---|
| #4 | 40 | 5/16" | 0.22" | 690 |
| #6 | 32 | 11/32" | 0.26" | 1,040 |
| #8 | 32 | 3/8" | 0.29" | 1,510 |
| #10 | 24 | 7/16" | 0.35" | 2,220 |
| 1/4" | 20 | 7/16" | 0.41" | 3,430 |
| 5/16" | 18 | 9/16" | 0.53" | 5,340 |
| 3/8" | 16 | 5/8" | 0.61" | 7,800 |
| 1/2" | 13 | 3/4" | 0.81" | 13,500 |
| 5/8" | 11 | 15/16" | 1.00" | 21,200 |
| 3/4" | 10 | 1-1/8" | 1.19" | 30,900 |
Dimensional Specifications (Metric Series)
| Nominal Size (M) | Thread Pitch (mm) | Width Across Flats (A/F) mm | Height (Approx.) mm | Proof Load (kN) - Property Class 8.8 |
|---|---|---|---|---|
| M4 | 0.7 | 7 | 5.6 | 4.85 |
| M5 | 0.8 | 8 | 6.8 | 7.60 |
| M6 | 1.0 | 10 | 8.1 | 11.0 |
| M8 | 1.25 | 13 | 10.5 | 20.1 |
| M10 | 1.5 | 17 | 13.2 | 31.4 |
| M12 | 1.75 | 19 | 15.8 | 45.3 |
| M16 | 2.0 | 24 | 20.3 | 81.5 |
| M20 | 2.5 | 30 | 25.0 | 127 |
| M24 | 3.0 | 36 | 29.7 | 183 |
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