Bronze Ground Rod Clamps & Earth Rod Clamps – Cast & Threaded, 1/2″, 5/8″, 3/4″ Sizes
Cable Glands India is a leading manufacturer and exporter of Bronze Ground Rod Clamps, also known as Bronze Earth Rod Clamps, Ground Rod Connector Clamps, or Earth Electrode Clamps. These are precision cast and threaded bronze fittings used to make solid, low-resistance connections between earthing conductors (bare copper wire, copper tape, or stranded cable) and driven earth rods or ground rods. Available in standard sizes of 1/2 inch, 5/8 inch, and 3/4 inch to match standard earth rod diameters, our bronze ground rod clamps comply with UL, IEEE, BS, IS, and IEC earthing standards.
What Are Bronze Ground Rod Clamps?
A bronze ground rod clamp (earth rod clamp) is a cast bronze fitting with a threaded or bolted clamping mechanism that mechanically secures a bare copper earthing conductor to a driven earth rod or ground rod. The clamp creates a durable metallic bond between the conductor and the electrode, forming a reliable low-impedance earth path for fault current dissipation. Unlike mechanical lugs, the threaded and cast construction of these clamps ensures maximum conductor contact area and long-term stability in buried or exposed earthing installations.
Key Features
- Material: Cast Bronze (Gunmetal, Leaded Bronze, Aluminum Bronze, Silicon Bronze)
- Clamping Mechanism: Cast and threaded body with bronze or stainless steel clamping bolt
- Earth Rod Sizes: 1/2″ (12.5 mm), 5/8″ (16 mm), 3/4″ (19 mm) diameter
- Conductor Range: 16 mm² to 240 mm² (bare copper wire, stranded cable, copper tape)
- Rod Types: Copper-bonded steel rods, solid copper rods, galvanized steel rods, stainless steel rods
- Installation: Suitable for direct burial, concrete encasement, exposed installations
- Compliance: UL 467, IEEE 837, BS 7430, IS 3043, IEC 62561-2, NEC Article 250
Size Range & Technical Specifications – Ground Rod Clamps
| Part No. | Earth Rod Diameter | Rod Diameter (mm) | Conductor Range | Clamping Bolt | Body Material |
|---|---|---|---|---|---|
| GRC-1/2-16 | 1/2″ (Half Inch) | 12.5 mm | 16 – 50 mm² (bare Cu) | Bronze / SS 304 Bolt | Cast Bronze C83600 |
| GRC-1/2-35 | 1/2″ (Half Inch) | 12.5 mm | 35 – 70 mm² (bare Cu) | Bronze / SS 304 Bolt | Cast Bronze C83600 |
| GRC-5/8-16 | 5/8″ (Five-eighth) | 16 mm | 16 – 50 mm² (bare Cu) | Bronze / SS 304 Bolt | Cast Bronze C83600 |
| GRC-5/8-50 | 5/8″ (Five-eighth) | 16 mm | 50 – 120 mm² (bare Cu) | Bronze / SS 304 Bolt | Cast Bronze C83600 |
| GRC-5/8-95 | 5/8″ (Five-eighth) | 16 mm | 95 – 150 mm² (bare Cu) | Bronze / SS 316 Bolt | Cast Bronze C95400 |
| GRC-3/4-35 | 3/4″ (Three-quarter) | 19 mm | 35 – 70 mm² (bare Cu) | Bronze / SS 304 Bolt | Cast Bronze C83600 |
| GRC-3/4-95 | 3/4″ (Three-quarter) | 19 mm | 95 – 150 mm² (bare Cu) | Bronze / SS 316 Bolt | Cast Bronze C83600 |
| GRC-3/4-120 | 3/4″ (Three-quarter) | 19 mm | 120 – 240 mm² (bare Cu) | Bronze / SS 316 Bolt | Cast Bronze C95400 |
Bronze Alloys Used in Ground Rod Clamps – US & International Comparison
| Alloy Name | US Standard (ASTM/UNS) | International Standard | Composition | Key Properties for Earthing |
|---|---|---|---|---|
| Leaded Tin Bronze (Gunmetal) | ASTM B62 / UNS C83600 | BS 1400 LG2 / IS 318 Gr.1 / DIN 1705 GBz12 | Cu 85%, Sn 5%, Zn 5%, Pb 5% | Most common earthing clamp alloy; excellent soil and atmospheric corrosion resistance, good thread cutting, pressure-tight cast body |
| Phosphor Bronze | ASTM B139 / UNS C51000 | BS 2874 PB102 / IS 7811 / DIN CuSn5 | Cu 94.8%, Sn 5%, P 0.2% | High strength, excellent spring fatigue properties, good corrosion resistance in acidic soils |
| Aluminum Bronze | ASTM B148 / UNS C95400 | BS 1400 AB1 / IS 305 / DIN CuAl10Fe3 | Cu 86%, Al 10%, Fe 4% | High tensile strength, excellent corrosion resistance in polluted or chemical soils |
| Silicon Bronze | ASTM B99 / UNS C65500 | BS 2872 CS101 / DIN CuSi3Mn1 | Cu 97%, Si 3%, Mn 1% | Excellent corrosion resistance for buried electrodes, high strength, weldable |
| Manganese Bronze | ASTM B138 / UNS C67500 | BS 2874 / DIN CuZn37Mn3Al2 | Cu 58%, Zn 37%, Mn 3%, Al 2% | High mechanical strength, good wear resistance for high-torque clamping applications |
| Naval Brass / Tobin Bronze | ASTM B21 / UNS C46400 | BS 2874 CZ112 / DIN CuZn38Sn1 | Cu 60%, Zn 39%, Sn 1% | Good dezincification resistance, moderate strength for exposed installations |
| Tin Bronze (High Tin) | ASTM B505 / UNS C90700 | BS 1400 PB1 / IS 318 Gr.3 / DIN 2.1050 | Cu 89%, Sn 11% | High hardness and corrosion resistance for aggressive soil environments |
| Nickel Aluminum Bronze | ASTM B148 / UNS C95800 | BS 1400 AB2 / DIN CuAl10Fe5Ni5 | Cu 81%, Al 9%, Fe 5%, Ni 5% | Superior corrosion resistance in highly aggressive soils, offshore, and marine earthing systems |
Earth Rod / Ground Rod Diameter Standard Reference
| Earth Rod Size (Imperial) | Diameter (mm) | Common Rod Type | Standard |
|---|---|---|---|
| 1/2″ (Half Inch) | 12.7 mm | Copper-bonded steel, solid copper | UL 467, IEEE 837, BS 7430, IS 3043 |
| 5/8″ (Five-eighths Inch) | 15.9 mm (≈16 mm) | Copper-bonded steel, solid copper (most common) | UL 467, IEEE 837, NEC Art. 250 |
| 3/4″ (Three-quarter Inch) | 19.05 mm (≈19 mm) | Copper-bonded steel, solid copper | UL 467, IEEE 837, BS 7430 |
Applications of Bronze Ground Rod Clamps
- Electrical earthing systems for residential, commercial, and industrial installations
- Power substation grounding grid connections to driven earth rods
- Telecommunications tower and antenna structure earthing
- Lightning protection system (LPS) earth electrode connections (IEC 62305)
- Renewable energy (solar PV, wind turbine) DC and AC earthing systems
- Railway and transportation earthing and bonding systems
- Oil and gas wellhead, pipeline, and tank earthing
Why Choose Cable Glands India for Bronze Ground Rod Clamps?
- Cast and threaded construction for superior conductor grip and long-term mechanical stability
- Available in 1/2″, 5/8″, and 3/4″ earth rod sizes for copper-bonded and solid copper rods
- UL 467, IEEE 837, BS 7430, IS 3043, IEC 62561-2 compliant designs
- Custom conductor range combinations and alloy grades available
- Global export: UK, USA, UAE, Australia, South Africa, Southeast Asia, Europe
Frequently Asked Questions (FAQs)
What sizes of earth rods do your bronze ground rod clamps fit?
Our bronze ground rod clamps are available for standard earth rod (ground rod) diameters of 1/2 inch (12.5 mm), 5/8 inch (16 mm), and 3/4 inch (19 mm), suitable for copper-bonded steel, solid copper, galvanized steel, and stainless steel earth rods.
What is the difference between a cast ground rod clamp and a stamped clamp?
A cast bronze ground rod clamp has a solid cast body that fully encircles the earth rod, providing superior contact area, mechanical strength, and long-term stability in buried installations. Stamped or sheet metal clamps are lighter and less expensive but may not meet the mechanical strength requirements of IEEE 837 or UL 467 for permanent buried installations.
Can bronze ground rod clamps be buried directly in soil?
Yes. Cast bronze ground rod clamps made from ASTM B62 / C83600 (Leaded Tin Bronze) or ASTM B148 / C95400 (Aluminum Bronze) are suitable for direct burial in most soil types. For highly aggressive soils (acidic, high chloride, or industrial contaminated soils), Silicon Bronze (C65500) or Nickel Aluminum Bronze (C95800) variants are recommended.
What standards apply to bronze earth rod clamps?
Our bronze ground rod clamps are designed to comply with UL 467 (USA), IEEE 837 (USA), BS 7430 (UK), IS 3043 (India), IEC 62561-2 (International), and NEC Article 250 (USA National Electrical Code) earthing requirements.
Do you supply custom conductor range earth rod clamps?
Yes. We manufacture bronze earth rod clamps to customer-specified conductor cross-sections (16 mm² to 240 mm²), rod diameters, alloy grades, and surface finishes. OEM supply and custom marking are available.
Get a Quote for Bronze Ground Rod Clamps
Contact us by email or phone to discuss your requirements for Bronze Ground Rod Clamps and Earth Rod Clamps — including earth rod diameter (1/2″, 5/8″, or 3/4″), conductor cross-section, alloy grade, applicable standard (UL 467, IEEE 837, BS 7430, IS 3043), quantity, and delivery destination. Our engineers will be happy to assist and quote you quickly.
📧 Email: sales@cableglandsindia.com
📞 Phone: +91-22-43449300 | +91-22-43449323