Composite Fastener Solution
Vinyl ester resin hex flanged nuts are composite fasteners made from a vinyl ester resin matrix reinforced with E-glass. They are used with vinyl ester or other FRP threaded rods in corrosive, electrically sensitive, and weight-sensitive applications.
Technical Specifications
| Parameter | Value/Range |
|---|---|
| Material | Vinyl ester resin with E-glass reinforcement |
| Imperial Thread Sizes | 3/8″-16, 1/2″-13, 5/8″-11, 3/4″-10, 1″-8 |
| Metric Diameters | 9.5 mm, 12.7 mm, 15.9 mm, 19.1 mm, 25.4 mm |
| Thread Shear Strength | 1,200 lbs (545 kg) for 1/2″-13 size |
| Flexural Strength | 413 MPa |
| Flexural Modulus | 13.8 GPa |
| Ultimate Double Shear Strength | 1,905 kg – 12,428 kg (size dependent) |
| Dielectric Strength | 1.58 kV/mm |
| Water Absorption | 1% (24 hr) |
| Coefficient of Thermal Expansion | 9.5×10-6 K-1 |
| Flammability | Self-extinguishing per ASTM D635 |
| Temperature Range | -35F (-37C) to 200F (93C) |
| Recommended Torque | 3 ft-lbs (3/8″-16), 8 ft-lbs (1/2″-13), 12 ft-lbs (5/8″-11) |
| Max Torque (Square Nut) | 3.32 m-kg (32.6 Nm) for 19.1 mm (10 UNC) |
Values are typical for standard formulations; request a data sheet for the specific grade.
Application Scenarios
- Chemical Processing: Fasteners in areas exposed to acids, alkalis, and organic solvents.
- Marine Environments: Resistant to saltwater corrosion and marine growth.
- Electrical Infrastructure: Non-conductive, reducing grounding and leakage concerns.
- Water Treatment: Suitable for chlorine and treatment chemical exposure when properly specified.
- Radio Communication Towers: Non-metallic, reducing electromagnetic interference concerns.
- Outdoor Structures: UV-stabilized formulations available for weather exposure.
Key Advantages
- Chemical Resistance: Suitable for many acidic and alkaline environments.
- Strength-to-Weight Ratio: Lighter than metal equivalents of the same thread size.
- Electrical Insulation: 1.58 kV/mm dielectric strength helps reduce current leakage and galvanic corrosion.
- Non-Magnetic Properties: Low interference with sensitive electronic equipment and magnetic fields.
- Low Thermal Expansion: 9.5×10-6 K-1 coefficient supports dimensional stability across temperature changes.
- Safety: Non-sparking and lighter than metal, which can reduce handling strain.
Comparative Analysis
| Feature | Vinyl Ester Resin Nut | Polyester Resin Nut | Epoxy Resin Nut |
|---|---|---|---|
| Chemical Resistance | Good to Excellent | Good | Good to Excellent |
| Mechanical Strength | High | Moderate | High |
| Electrical Insulation | Yes | Yes | Yes |
| UV/Weather Resistance | Good to Excellent | Good | Good to Excellent |
| Temperature Range (F) | -35 to 200 | -35 to 200 | -40 to 250 |
| Weight | Light | Light | Light |
| Cost | Moderate | Lower | Higher |
| Flexural Strength | 413 MPa | ~300 MPa | ~450 MPa |
| Water Absorption | 1% | 1.5% | 0.5% |
Comparisons are approximate; actual properties vary by manufacturer and resin formulation.
Installation Guidelines
For best results:
- Use standard hand or power tools for installation.
- For cutting or drilling, use carbide-tipped tools to reduce fiber fraying.
- Apply recommended torque values – avoid over-tightening.
- Seal cut or drilled surfaces with a compatible sealer to maintain corrosion resistance.
- Store in dry conditions prior to installation.
Frequently Asked Questions
| Question | Answer |
|---|---|
| How do these nuts compare to 316 stainless steel in marine environments? | Vinyl ester nuts resist saltwater corrosion and do not suffer from galvanic or pitting corrosion like metals can. Actual service life depends on temperature, load, and exposure conditions. |
| Can these nuts withstand high-pressure washdown procedures? | They can generally withstand high-pressure washdown within their rated temperature range. Confirm the specific formulation and operating temperature with our team. |
| What is the difference between vinyl ester and polyester resin nuts? | Vinyl ester generally offers better chemical resistance, particularly to acids and oxidizing chemicals, and higher mechanical strength than standard polyester nuts. Exact differences depend on formulation. |
| Are these nuts suitable for structural applications? | Yes, within their specified load limits. For example, a 1/2″-13 nut has a thread shear strength of 1,200 lbs (545 kg). Engineering review is recommended for structural designs. |
| How long can these nuts last in outdoor applications? | Service life depends on UV exposure, temperature, and loading. UV-stabilized grades can provide extended outdoor performance. Contact us for project-specific guidance. |
| Can I replace all metal fasteners with these composite nuts? | They are suitable for many applications but not all. Avoid high-temperature environments above the rated limit and applications requiring tensile strength beyond the product rating. |
Value Proposition
Vinyl ester resin hex flanged nuts provide a non-metallic fastening option for corrosive and electrical applications. By reducing corrosion-related maintenance and offering electrical insulation, they can lower lifecycle costs in suitable environments compared with metal fasteners.
These nuts are designed to mate with our vinyl ester hex flange bolts for a fully resin-matched assembly.
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