The Bolt Type Tension Clamp secures electrical conductors to support structures in overhead power transmission and distribution systems, providing mechanical support and tensioning to protect conductors from wind and vibrations while maintaining grid integrity.
The clamp enables easy installation with standard tools and features robust, corrosion-resistant construction that withstands moisture, UV radiation, and temperature fluctuations. Its secure gripping mechanism prevents conductor slippage, while adjustable tensioning enables precise sag control. Components include a body that grips the conductor, bolts, nuts, washers, and U-bolts or split pins for assembly.
Material composition includes high-strength aluminum alloy for the body, with hot-dip galvanized steel or stainless steel bolts for corrosion resistance. The NLL and NLD series accommodate conductor diameters from 5mm to 32.6mm, with tension loads up to 100 kilonewtons (kN). The aluminum alloy NLL series suits overhead lines up to 35 kilovolts (kV), while the malleable iron NLD series serves similar applications.
Applications include overhead transmission and distribution lines, substations, and angle poles up to 90 degrees. The clamp complies with international standards including IEC 61284, BS 3288-2, ASTM A153, and GB/T 2314, with grip strength typically not less than 95% of conductor breaking force.
Enhance Power Transmission with RaxPower’s Bolt Type Tension Clamp Supplier
Who We Are
We are RaxPower, founded in 2003 and located in Hebei Province, China. As a primary domestic professional manufacturer of electric power fitting and cable accessory, we have accumulated 21 years of manufacturing and exporting experience. With over 170 employees, including 30 professional technicians and 10 engineers, we focus on innovation and customer-focused solutions to provide the most suitable products for global clients.
What We Do
Our Bolt Type Tension Clamp leverages our advanced manufacturing processes, such as hot forging and automatic machining, ensuring superior strength, accurate sizing, and reliable performance. Crafted from high-quality materials, it offers easy installation, corrosion resistance, and secure gripping for overhead line construction, backed by our 17,000 square meters of production workshops and 5,000 square meters of warehouses.
Quality Assurance
We implement strict quality control with raw material selection, multi-stage testing, and 100% quality review before packing. Our products have passed SGS tests and adhere to international standards, guaranteeing durability and safety in diverse environments.
Global Reach
As a one-stop global supplier, we have established a mature marketing network, serving customers in over 70 countries worldwide with timely delivery and customized services.
Call to Action
Contact us today to discover how our Bolt Type Tension Clamp can enhance your power transmission projects with efficiency and reliability.
| Type | Applicable Conductor Diameter (mm) | Number of Bolts | Bolt Size | Tension Load (kN) | Material | Grip Strength | Standards Compliance |
|---|---|---|---|---|---|---|---|
| NLL-1 | 5 – 15.5 | 2 | M12 | 68 | Aluminum alloy | ≥95% of conductor breaking force | IEC 61284, BS 3288-2, ASTM A153, GB/T 2314 |
| NLL-2 | 8.5 – 19.6 | 2 | M12 | 86 | Aluminum alloy | ≥95% of conductor breaking force | IEC 61284, BS 3288-2, ASTM A153, GB/T 2314 |
| NLL-3 | 11.4 – 22.6 | 2 | M14 | 93 | Aluminum alloy | ≥95% of conductor breaking force | IEC 61284, BS 3288-2, ASTM A153, GB/T 2314 |
| NLL-4 | 13 – 26.4 | 3 | M14 | 93 | Aluminum alloy | ≥95% of conductor breaking force | IEC 61284, BS 3288-2, ASTM A153, GB/T 2314 |
| NLL-4L | 12.4 – 21.6 | 4 | M16 | 90 | Aluminum alloy | ≥95% of conductor breaking force | IEC 61284, BS 3288-2, ASTM A153, GB/T 2314 |
| NLL-5L | 22 – 29 | 3 | M16 | 90 | Aluminum alloy | ≥95% of conductor breaking force | IEC 61284, BS 3288-2, ASTM A153, GB/T 2314 |
| NLL-6L | 25.9 – 32.6 | 7 | M16 | 100 | Aluminum alloy | ≥95% of conductor breaking force | IEC 61284, BS 3288-2, ASTM A153, GB/T 2314 |
| NLD-1 | 5.0 – 10.0 | 2 | M12 | 18 | Malleable iron | ≥95% of conductor breaking force | IEC 61284, BS 3288-2, ASTM A153, GB/T 2314 |
| NLD-2 | 10.1 – 14.0 | 3 | M12 | 41 | Malleable iron | ≥95% of conductor breaking force | IEC 61284, BS 3288-2, ASTM A153, GB/T 2314 |
| NLD-3 | 14.1 – 18.0 | 4 | M16 | 71 | Malleable iron | ≥95% of conductor breaking force | IEC 61284, BS 3288-2, ASTM A153, GB/T 2314 |
| NLD-4 | 18.1 – 23.0 | 5 | M16 | 91 | Malleable iron | ≥95% of conductor breaking force | IEC 61284, BS 3288-2, ASTM A153, GB/T 2314 |
Frequently Asked Questions (FAQS)
Bolted Type Dead End Tension Clamps Before Packing
What is a bolt type tension clamp and what is its primary function?
A bolt type tension clamp is a hardware component used in overhead power distribution systems to secure conductors to support structures such as poles or towers. It provides mechanical support and tension, preventing excessive movement and ensuring safe and efficient electricity transmission in transmission and distribution lines.
What materials are used in the construction of the bolt type tension clamp?
The clamp is constructed from high-strength aluminum alloy or hot-dip galvanized steel. Components include the body and keeper made from aluminum alloy, split pins from stainless steel, and other parts from hot-dip galvanized steel. Corrosion-resistant coatings withstand moisture, UV radiation, and temperature fluctuations. Hot-dip galvanizing per ISO 1461 provides a smooth, bright finish with mean coating thickness over 85 microns, ensuring durability in extreme weather and harsh environments for years.
How is the bolt type tension clamp installed?
Installation involves cleaning the conductor, selecting the correct clamp size, and tightening bolts to specified torque in proper sequence. The bolted-type design requires only standard tools like wrenches, allowing straightforward setup by one person without specialized equipment. This simplicity reduces labor time and costs, making it efficient for overhead line construction and maintenance.
What is the grip strength of the bolt type tension clamp?
The grip strength ranges from 85% to 95% of the conductor's rated ultimate strength, providing a secure hold that prevents conductor slippage and ensures reliable mechanical support.
What standards and certifications does the bolt type tension clamp comply with?
RaxPower's bolt type tension clamp complies with international standards including IEC, BS, ISO, ANSI, and ASTM. The clamps undergo comprehensive testing, including load tests and galvanization checks per ISO 1461, and hold certifications from authoritative bodies like CE, BV, and SGS. This ensures full compliance with safety and performance requirements for overhead power lines up to 35kV.
What are the available series and their specifications?
Common series include NLL and NLD, with models like NLL-1, NLL-2, and NLL-3 designed for specific cable diameters. For example, NLL-1 fits conductors from Ø5-15.5mm with a tension load of 68kV. Specifications vary by model to accommodate different conductor sizes, types, and support structures like wooden poles and steel towers.
Can the tension clamps be customized for specific project requirements?
Yes, we offer OEM services including custom markings such as your company's identification, tensile strength ratings, and conductor diameter ranges. RaxPower utilizes advanced manufacturing processes with automatic machines and semi-automatic molds to ensure precise customization while maintaining consistent quality and on-time delivery for bulk orders.
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