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Presenting coupling nuts from GIC Fasteners, made to the finest performance and quality requirements. Our coupling nuts meet or exceed DIN, ASTM, ISO, and BS standards, guaranteeing dependability and compatibility in a variety of settings. They satisfy comparable international requirements and are designed for strength and longevity, which makes them perfect for attaching threaded rods and other hardware. For superb performance in every project, rely on GIC Fasteners' expertly crafted coupling nuts.
Extension nuts, sometimes referred to as coupling nuts, are crucial parts of many engineering and building projects. The purpose of these hex-shaped fasteners is to link two male threads, giving threaded rods, bolts, and other hardware a longer grip and a solid connection. At GIC Fasteners, we provide high-quality coupling nuts in a range of sizes and materials to fulfill the unique demands of your project. Whether you’re working on a tiny DIY project or a huge construction site, our coupling nuts guarantee dependability, durability, and simplicity of use.
Selecting GIC Fasteners means choosing exceptional craftsmanship and industry-leading customer service. Our knowledgeable staff is committed to assisting you in selecting the ideal coupling nuts for your needs, guaranteeing a tight fit and reliable operation. Send us an email at sales@gicfasteners.com to discuss your needs and receive a quote—don’t settle for anything less than the finest. For all of your fastening needs, put your trust in GIC Fasteners and discover the difference in quality and service.
| Standard | : | DIN, ASTM, BS, ISO, JIS, IS, GB, IS 4190 and all other International Standards |
| Length | : | 3 mm to 200 mm |
| Size | : | M3 – M56 | 3/6″ to 2″ | Custom Sizes |
| Threads: | : | BSF, UNF METRIC, UNC, BSW or as required |
| Finish | : | Plain, black, zinc plated (Cr,3+), zinc plated(Cr,6+), hot dipped galvanized, dacromet, nickel plated, cadmium plated, etc. |
| Forming | : | Hot & Cold Forged |
| Variants | : | Fully Threaded Coupling Nuts, Partial Threaded Coupling Nuts, Metric Coupling Nuts, Imperial Coupling Nuts |
| Coatings | : | PTFE (Teflon), Hot Dip Galvanizing, Aluminum Zinc Flake, Zinc Phosphating, Manganese Phosphating, Metallic Zinc, Nickel Bolts Plating, Chrome Plating, Cadmium Plating, Silver Plating, Tin Plating |
|
Nominal Size |
Basic
Major Diameter of Thread |
F | G | H | |||||
|
Width Across Flats |
Width Across Corners |
Thickness
Hex Nut |
|||||||
| basic | min | max. | min. | max. | basic | min. | max. | ||
| #6 | 0.138 | 5/16 | 0.302 | 0.312 | 0.344 | 0.361 | 1/2 | 0.470 | 0.510 |
| #8 | 0.164 | 5/16 | 0.302 | 0.312 | 0.344 | 0.361 | 5/8 | 0.595 | 0.645 |
| #10 | 0.190 | 5/16 | 0.302 | 0.312 | 0.344 | 0.361 | 3/4 | 0.711 | 0.760 |
| 1/4 | 0.250 | 7/16 | 0.428 | 0.438 | 0.488 | 0.505 | 1 3/4 | 1.690 | 1.760 |
| 5/16 | 0.312 | 1/2 | 0.489 | 0.500 | 0.557 | 0.577 | 1 3/4 | 1.690 | 1.760 |
| 3/8 | 0.375 | 9/16 | 0.551 | 0.562 | 0.628 | 0.650 | 1 3/4 | 1.690 | 1.760 |
| 7/16 | 0.437 | 5/8 | 0.607 | 0.625 | 0.692 | 0.722 | 1 3/4 | 1.690 | 1.760 |
| 1/2 | 0.500 | 11/16 | 0.663 | 0.688 | 0.756 | 0.794 | 1 3/4 | 1.690 | 1.760 |
| 9/16 | 0.562 | 13/16 | 0.782 | 0.813 | 0.891 | 0.939 | 2 1/8 | 2.067 | 2.135 |
| 5/8 | 0.625 | 13/16 | 0.782 | 0.813 | 0.891 | 0.939 | 2 1/8 | 2.067 | 2.135 |
| 3/4 | 0.750 | 1 | 0.963 | 1.000 | 1.097 | 1.155 | 2 1/4 | 2.190 | 2.260 |
| 7/8 | 0.875 | 1 1/4 | 1.212 | 1.250 | 1.382 | 1.443 | 2 1/2 | 2.440 | 2.510 |
| 1 | 1.000 | 1 3/8 | 1.325 | 1.375 | 1.511 | 1.588 | 2 3/4 | 2.690 | 2.760 |
|
Nominal Size |
Basic
Major Diameter of Thread |
F | G | H | |||||
|
Width Across Flats |
Width Across Corners |
Thickness
Hex Nut |
|||||||
| basic | min | max. | min. | max. | basic | min. | max. | ||
| 1 1/8 | 1.125 | 1 1/2 | 1.450 | 1.500 | 1.653 | 1.732 | 3 | 2.940 | 3.010 |
| 1 1/4 | 1.250 | 1 5/8 | 1.575 | 1.625 | 1.825 | 1.876 | 3 | 2.940 | 3.010 |
| 1 1/2 | 1.500 | 2 | 1.950 | 2.000 | 2.275 | 2.309 | 3 1/2 | 3.440 | 3.510 |
| 1 5/8 | 1.625 | 2 9/16 | 2.481 | 2.562 | 2.828 | 2.959 | 4 7/8 | 4.830 | 4.910 |
| 1 3/4 | 1.750 | 2 3/4 | 2.662 | 2.750 | 3.035 | 3.175 | 5 1/4 | 5.210 | 5.290 |
| 1 7/8 | 1.875 | 2 15/16 | 2.844 | 2.938 | 3.242 | 3.392 | 5 5/8 | 5.580 | 5.670 |
| 2 | 2.000 | 3 1/8 | 3.025 | 3.125 | 3.448 | 3.608 | 6 | 5.950 | 6.040 |
| 2 1/4 | 2.250 | 3 1/2 | 3.388 | 3.500 | 3.862 | 4.041 | 6 3/4 | 6.700 | 6.800 |
| 2 1/2 | 2.500 | 3 7/8 | 3.750 | 3.875 | 4.275 | 4.474 | 7 1/2 | 7.440 | 7.550 |
| 2 3/4 | 2.750 | 4 1/4 | 4.112 | 4.250 | 4.688 | 4.907 | 8 1/4 | 8.190 | 8.310 |
| 3 | 3.000 | 4.5/8 | 4.475 | 4.625 | 5.101 | 5.340 | 9 | 8.940 | 9.060 |
|
Nominal Size |
Basic
Major Diameter of Thread |
F | G | H | |||||
|
Width Across Flats |
Width Across Corners |
Thickness
Hex Nut |
|||||||
| basic | min | max. | min. | max. | basic | min. | max. | ||
| 3 1/4 | 3.250 | 5 | 4.838 | 5.000 | 5.515 | 5.773 | 9 3/4 | 9.680 | 9.810 |
| 3 1/2 | 3.500 | 5 3/8 | 5.200 | 5.375 | 5.928 | 6.206 | 10 1/2 | 10.430 | 10.570 |
| 3 3/4 | 3.750 | 5 3/4 | 5.562 | 5.750 | 6.340 | 6.639 | 11 1/4 | 11.170 | 11.320 |
| 4 | 4.000 | 6 1/8 | 5.925 | 6.125 | 6.754 | 7.072 | 12 | 11.920 | 12.080 |
| 4 1/4 | 4.250 | 6 1/2 | 6.288 | 6.500 | 7.168 | 7.506 | 12 3/4 | 12.670 | 12.830 |
| 4 1/2 | 4.500 | 6 7/8 | 6.650 | 6.875 | 7.581 | 7.939 | 13 1/2 | 13.420 | 13.580 |
| 4 3/4 | 4.750 | 7 1/4 | 7.012 | 7.250 | 7.994 | 8.372 | 14 1/4 | 14.160 | 14.340 |
| 5 | 5.000 | 7 5/8 | 7.375 | 7.625 | 8.408 | 8.805 | 15 | 14.910 | 15.090 |
| 5 1/4 | 5.250 | 8 | 7.738 | 8.000 | 8.821 | 9.238 | 15 3/4 | 15.650 | 15.850 |
| 5 1/2 | 5.500 | 8 3/8 | 8.100 | 8.375 | 9.234 | 9.671 | 16 1/2 | 16.400 | 16.600 |
| 5 3/4 | 5.750 | 8 3/4 | 8.462 | 8.750 | 9.647 | 10.104 | 17 1/4 | 17.150 | 17.350 |
| 6 | 6.000 | 9 1/8 | 8.825 | 9.125 | 10.060 | 10.537 | 18 | 17.890 | 18.110 |
| Industry | Applications |
|---|---|
| Construction | Joining structural elements, such as beams and columns |
| Automotive | Securing exhaust systems, engine components |
| Machinery | Connecting rotating components, securing parts in heavy machinery |
| Electronics | Mounting electronic devices, securing panels and enclosures |
| Plumbing | Joining pipes and fixtures, ensuring leak-proof connections |
| Aerospace | Securing components in aircraft, spacecraft assembly |
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A coupling nut is a threaded fastener used to connect two threaded rods or bolts. Unlike regular nuts, coupling nuts are elongated to provide additional length for joining multiple components securely.
Coupling nuts are commonly made from materials like stainless steel, brass, and alloy steel. The choice depends on factors such as environmental conditions, required strength, and corrosion resistance. Stainless steel is ideal for corrosive environments, while brass is suitable for electrical applications.
Yes, coupling nuts come in various thread sizes and pitches to accommodate different bolt or rod sizes. It's essential to choose a coupling nut with the correct thread size and pitch to ensure a proper fit and secure connection.
Yes, coupling nuts can be used for both permanent and temporary connections. For temporary connections, they provide a convenient way to join threaded rods temporarily, while for permanent connections, they offer a durable and stable solution.
Our coupling nuts adhere to international standards such as DIN, ASTM, ISO, and BS. We provide certifications and detailed product specifications to ensure compliance with industry standards and meet the quality requirements of our customers.
Yes, coupling nuts made from heat-resistant materials like stainless steel can withstand high temperatures. It's crucial to select the appropriate material based on the specific temperature range of your application to ensure optimal performance.
Yes, we offer custom coupling nut solutions tailored to meet the specific requirements of our customers. Our engineering team can work with you to design coupling nuts with unique dimensions, materials, or coatings to suit your application needs.
To ensure a secure connection, clean the threads of the rods or bolts, insert the coupling nut, and tighten it using a suitable wrench. Avoid over-tightening, as it may damage the threads. Follow the recommended torque values and guidelines provided in the product specifications for proper installation.
Our coupling nuts, especially those made from stainless steel or coated with corrosion-resistant materials, offer excellent corrosion resistance, making them suitable for outdoor applications. They are designed to withstand harsh environmental conditions, ensuring long-lasting performance and reliability.
