Complete Guide to Fiberglass Threaded Rods: Strength, Sizes, and Applications

1. What Is a Fiberglass Threaded Rod?

A fiberglass threaded rod is a type of composite fastener made from glass fiber reinforced polymer (GFRP). It combines high tensile strength with excellent chemical resistance, making it an ideal replacement for traditional metal bolts and rods in corrosive, non-conductive, or lightweight applications.

Unlike solid steel rods, fiberglass threaded rods are:

• Non-conductive

• Non-magnetic

• Corrosion-resistant

• Lightweight (around 25% of steel weight)

They are typically manufactured using pultrusion and threaded by machining or molding, often featuring UNC or metric threads.

2. Common Sizes and Specifications

Fiberglass threaded rods are available in imperial and metric standards, with 1/2 inch and M12 being among the most popular.

Typical Imperial Sizes (inch):

• 1/4", 3/8", 1/2", 5/8", 3/4", 1"

• Standard length: 36", 48", 72", or custom cut

Metric Equivalents (mm):

Surface Options:

• Full thread or partial thread

• Natural color: yellow, gray, white (custom colors available)

Thread Type:

• UNC/UNF (Unified National Thread)

• Metric (M-thread)

3. Tensile Strength and Mechanical Properties

Fiberglass threaded rods are engineered to deliver strong performance in structural and fastening systems. Their tensile strength depends on the rod diameter, fiber content, and resin type.

Typical Tensile Strength:

• 1/2" (12 mm): 500–800 MPa

• 3/4" (20 mm): 600–1000 MPa

Other properties:

• Temperature range: -40°C to 120°C continuous (up to 150°C short-term)

• Dielectric strength: Excellent for electrical insulation

• Creep resistance: Good under sustained load

Note: Performance may vary slightly by supplier and manufacturing process.

4. Applications of Threaded Fiberglass Rods

Due to their durability and corrosion resistance, these rods are ideal for:

• Electrical enclosures and switchgear

• Chemical processing plants

• Water treatment facilities

• Marine and coastal structures

• Underground installations

• Non-magnetic or explosive environments

They are also used in civil engineering for:

• Bridge formwork

• Insulating connectors in concrete

• Corrosion-resistant anchoring systems

5. How to Choose Reliable Fiberglass Threaded Rod Suppliers

When selecting a supplier, consider the following:

6. Where to Buy: GTOFRP™ Fiberglass Threaded Rods

At GTOFRP™, we supply high-performance fiberglass threaded rods in a wide range of diameters, thread types, and custom lengths. Our products are:

• Made from premium E-glass fibers

• Compliant with ASTM D3917 and IEC standards

• Customizable for OEM and industrial use

• Exported to clients across North America, Middle East, and Southeast Asia

Whether you need 1/2 fiberglass threaded rod for an electrical panel or a full pallet of metric rods for civil works, we're here to help.

Conclusion

Fiberglass threaded rods offer a unique blend of strength, safety, and corrosion resistance for critical applications. By understanding their specifications and choosing the right supplier, you can ensure reliable performance in even the harshest environments.