Bronze Bonding Clamps ,KUL Type Bonding Clamps
Bonding Clamps
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Bronze Bonding Clamps – KUL Type are high-performance grounding and bonding connectors engineered for secure electrical bonding of #6 copper wire to 1/4” or 5/16” strand. These clamps are widely used in utility grounding, industrial earthing, and bonding networks where long-term conductivity, corrosion resistance, and mechanical strength are critical.
Manufactured from high-strength bronze alloys with a Silicon Bronze bolt, KUL bonding clamps deliver excellent current transfer, vibration resistance, and durability in outdoor and harsh environments.
Made of high quality aluminum bronze alloy, they are special shaped clamps and mainly serve as cable holder. Made by fine sand casting with silicon bronze material.
Key Features & Technical Advantages
- Bonds #6 copper wire to 1/4″ or 5/16″ strand
- Bronze alloy clamp body for high conductivity and strength
- Silicon Bronze bolt for superior corrosion resistance
- Tin plated options for dissimilar metal applications
- No bolt removal required during installation
- Installs using standard terminal wrench
- Suitable for outdoor grounding and bonding
- UL and cUL listed bonding clamp design
Materials & Metallurgy
Clamp Body – Bronze Material Grades
The body of the KUL bronze bonding clamp is typically manufactured from high-conductivity, high-strength bronze alloys, selected for mechanical robustness and long-term electrical performance.
Commonly used bronze grades include:
| Standard | Alloy Designation | Typical Composition | Key Properties |
| ASTM / UNS | C84400 | Cu-Sn-Zn-Pb Bronze | Excellent castability, good conductivity |
| ASTM / UNS | C83600 | Red Brass | High corrosion resistance, good strength |
| ASTM / UNS | C85500 | High-Strength Bronze | Superior mechanical properties |
| ASTM / UNS | C90700 | Tin Bronze | High wear resistance, stable conductivity |
| EN | CuSn5 / CuSn7 | Tin Bronze | Structural strength, corrosion resistant |
| BS | PB1 / LG2 | Leaded Tin Bronze | Electrical & marine-grade durability |
These bronze alloys are preferred in grounding hardware due to their low resistivity, excellent fatigue resistance, and non-magnetic properties.
Bolt & Fastener – Silicon Bronze
The bolt and nut assembly used in KUL bonding clamps is manufactured from Silicon Bronze, ensuring compatibility with copper conductors and superior corrosion resistance.
Typical Silicon Bronze Grades:
| Standard | Alloy |
| ASTM / UNS | C65100 |
| ASTM / UNS | C65500 |
| ASTM F468 / F593 | Silicon Bronze Fasteners |
Advantages of Silicon Bronze Bolt:
- Exceptional resistance to atmospheric & galvanic corrosion
- Maintains torque under vibration
- Electrically compatible with copper & bronze
- Ideal for grounding and bonding systems
Plating & Surface Finish Options
- Fully Tin Plated
- Recommended for dissimilar metal bonding
- Enhanced corrosion protection
- Preferred in utility & telecom grounding
- Semi-Tin Plated (Bare Bronze Groove)
- Direct bronze-to-copper contact
- Optimized conductivity in controlled environments
Installation & Field Use
- Bolt remains captive – no removal required
- Fast installation using a standard terminal wrench
- Suitable for retrofit grounding upgrades
- Reliable clamping force without conductor damage
Typical Applications
- Utility grounding & bonding systems
- Electrical earthing networks
- Ground grid installations
- Bonding copper wire to strand
- Industrial power distribution grounding
- Telecom and infrastructure grounding
- Outdoor electrical installations
- Dissimilar metal bonding connections
KUL Bonding Clamp – Standard Models
| Catalog No. | Description | Conductor Range | Pack Qty |
| CM1 | Semi-tin plated, one bare bronze groove | .162″ – .398″ | 100 |
| CM2 | Fully tin plated clamp | .162″ – .398″ | 100 |
| CM3 | Fully tin plated | #6 SOL – #1/0 STR | 100 |
| CM4 | Semi-tin plated | #6 SOL – #1/0 STR | 100 |
Compliance & Standards
- Designed to meet grounding & bonding hardware requirements
- Suitable for North American electrical installations
Frequently Asked Questions
Q1. Why is bronze used for bonding clamps?
Bronze offers an ideal balance of conductivity, strength, and corrosion resistance.
Q2. Why is the bolt Silicon Bronze?
Silicon Bronze prevents galvanic corrosion and maintains long-term torque in grounding systems.
Q3. Can these clamps be used outdoors?
Yes. Bronze body and silicon bronze bolt are ideal for outdoor environments.
Q4. Are these suitable for dissimilar metals?
Yes. Fully tin-plated versions are recommended.
Q5. Do these clamps meet UL requirements?
Yes. KUL bonding clamps are UL and cUL listed.
Why Source KUL Bronze Bonding Clamps from Us?
- Engineering-grade bronze alloys
- Silicon Bronze fasteners (not plated steel)
- Export-ready manufacturing
- Consistent quality & dimensional control
- Bulk supply for USA distributors & utilities
- Custom marking & packaging available
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