Tension Clamps
for Overhead Lines
As a professional tension clamp manufacturer and supplier based in China, we
provide a full range of bolt type, wedge type, compression, and helical tension
clamps designed to anchor and secure overhead conductors at dead-end
points, angle poles, and strain structures across distribution and transmission
networks.
Conductor RTS
Grip Strength
Year Designed
Service Life
Voltage Level
Coverage
Countries
Exported
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OEM & Customization
Custom Tension Clamp Solutions
As an experienced China tension clamp manufacturer, we support full OEM
customization. Whether you need a specific conductor size, a particular surface
treatment, or compliance with regional standards — our engineering team delivers.
Conductor Sizing
Custom groove profiles and body dimensions to match non-standard conductor diameters, stranding patterns, and bundle configurations beyond the standard NLL/NLD range.
01
Material Options
Choose from aluminum alloy, malleable iron, hot-dip galvanized steel, stainless steel, or composite-lined bodies. Material selection impacts weight, strength, corrosion life, and tension clamp price.
02
Surface Treatment
Hot-dip galvanizing, electro-galvanizing, Dacromet, powder coating, or marine-grade anti-corrosion treatment for coastal, tropical, high-pollution, or desert environments.
03
End Fitting Interface
Clevis, tongue, socket eye, ball eye, or shackle termination. Dimensions per IEC 60471 or custom drawings to match your insulator and hardware configuration.
04
Standards & Testing
Manufactured and tested to IEC, BS, ASTM, ANSI, GB/T, or your regional standard. Slip test, tensile test, and galvanizing thickness reports included with shipment.
05
Ready to Source Tension Clamps?
Tell us your conductor type, voltage level, quantity, and delivery destination.
Our team will respond with a detailed technical proposal and competitive
pricing within 24 hours.
Performance
Key Features of Our Tension Clamps
Every cable tension clamp we produce is engineered for decades of reliable
service in demanding overhead line environments.
High Mechanical Strength
Grip force ≥90% of conductor rated tensile strength, maintaining secure hold under dynamic wind, ice, and thermal cycling loads across all seasons.
Advanced Anti-Corrosion
All steel components hot-dip galvanized per BS EN ISO 1461 and ASTM A153/153M. Aluminum alloy body naturally resists oxidation. Stainless steel options for coastal installations.
Zero Electrolytic Reaction
Careful material pairing eliminates galvanic corrosion between clamp, hardware, and conductor — preserving both mechanical hold and electrical continuity over time.
No-Slip Performance
Zero conductor slippage up to 90% of rated ultimate strength under lab and field test conditions. Tension clamp fastening you can trust for mission-critical infrastructure.
Universal Compatibility
Compatible with ACSR, AAC, AAAC, and ACAR conductors. Works on wooden poles, concrete poles, and steel towers with standard clevis, tongue, and shackle interfaces.
Precision Tension Adjustment
Adjustable bolted designs allow precise sag and tension control during installation. Proper torque specification and tightening sequence ensure long-term reliable tension clamp connection.
Technical Data
NLL / NLD Series Bolt Type Tension Clamp Specifications
Standard bolted tension clamp models and technical parameters. Custom
specifications, dimensions, and rated strengths are available upon request —
contact us for a detailed tension clamp price quote for your project.
| Model | Conductor Ø (mm) | Applicable Wire | Rated Strength (kN) | Body Material | End Fitting | Approx. Weight |
|---|---|---|---|---|---|---|
| NLL-1 | 10.0 – 14.0 | LGJ-35/6 ~ 70/10 | 40 | Al Alloy | Clevis | 1.2 kg |
| NLL-2 | 14.0 – 18.0 | LGJ-95/15 ~ 120/20 | 70 | Al Alloy | Clevis | 2.0 kg |
| NLL-3 | 18.0 – 22.5 | LGJ-150/25 ~ 185/30 | 100 | Al Alloy | Clevis | 3.2 kg |
| NLL-4 | 22.5 – 28.0 | LGJ-240/30 ~ 300/40 | 120 | Al Alloy | Clevis | 4.5 kg |
| NLL-5 | 28.0 – 36.0 | LGJ-400/35 ~ 500/45 | 160 | Al Alloy | Clevis | 6.0 kg |
| NLD-1 | 10.0 – 14.0 | LGJF-50 ~ 70 | 45 | Malleable Iron | Clevis | 1.8 kg |
| NLD-2 | 14.0 – 18.0 | LGJF-95 ~ 120 | 80 | Malleable Iron | Clevis | 2.8 kg |
| NLD-3 | 18.0 – 22.5 | LGJF-150 ~ 185 | 110 | Malleable Iron | Clevis | 4.0 kg |
| NLD-4 | 22.5 – 28.0 | LGJF-240 ~ 300 | 130 | Malleable Iron | Clevis | 5.5 kg |
* Table shows standard China market models. We also manufacture tension clamps to IEC, BS, ASTM, ANSI, and other international specifications. Contact us for the full specification sheet or customized models.
Product Range
Types of Tension Clamps We Manufacture
We offer a comprehensive range of tension clamp designs to match different
conductor types, voltage levels, and installation requirements. Every type is
available for wholesale and can be customized to your project specifications.
Bolted Type Tension Clamp
Also known as:NLL tension clamp, quadrant strain clamp, guy type dead end clamp
The bolted type tension clamp is the most widely used strain clamp for overhead distribution lines rated up to 35kV. The NLL series features a high-strength aluminum alloy body with a 60° groove angle, paired with galvanized steel U-bolts, hex nuts, flat washers, and lock washers. For use with aluminum-clad steel conductors, the NLD series — made from malleable iron — is the ideal choice. Available in models NLL-1 through NLL-5 (and NLD-1 through NLD-4) to accommodate various conductor diameter ranges, this aluminum tension clamp provides a reliable, economical, and field-proven solution for ACSR, AAC, and AAAC conductor termination.
Wedge Type Tension Clamp
Also known as: wedge tension anchor clamp, self-locking tension clamp, wedge dead end clamp
The wedge tension clamp is a versatile design used in both overhead lines and substations. It consists of two forged bodies connected by a hinge, forming a wedge-shaped structure that converts tension load into compressive clamping force — the greater the tension, the greater the clamping force applied to the conductor. This self-locking mechanism makes the wedge type tension clamp especially reliable under dynamic loads. Available as single wedge or double wedge configurations, this high tension clamp is suitable for applications where maximum grip security and ease of installation are required.
Compression Type Tension Clamp
Also known as: hydraulic dead end clamp, crimped strain clamp
The compression tension clamp delivers a permanent, ultra-reliable connection through hydraulic press installation. Once crimped, the fitting creates a seamless bond with the conductor that cannot be removed or repositioned. This makes it the preferred solution for high-voltage transmission lines (110kV–500kV) where maximum mechanical and electrical reliability is non-negotiable. Each high tension cable clamp is sized to match specific conductor specifications and must be installed with calibrated hydraulic tooling to ensure proper compression force and contact resistance.
Helical Tension Clamp
Also known as: preformed dead end clamp, spiral rod tension clamp
The helical tension clamp uses preformed spiral rods that wrap around the conductor to evenly distribute grip force along a longer contact length. This design minimizes stress concentration and is particularly effective for vibration-sensitive environments. It is the standard choice for ADSS and OPGW fiber optic cable dead-end applications, as well as small-diameter conductors and ground wires. No special tools are needed — the rods are applied by hand, making it one of the fastest to install in the field.
ADSS & OPGW Tension Clamp
Also known as: OPGW dead end clamp, fiber tension clamp, optic cable tension clamp
Purpose-built for fiber optic infrastructure, the ADSS tension clamp and OPGW tension clamp secure all-dielectric self-supporting and optical ground wire cables at terminal and angle structures. These clamps use either helical rod or specialized bracket designs to grip the cable jacket without damaging internal optical fibers. Drop cable tension clamps are also available for FTTH distribution networks. As a dedicated tension clamp for fiber cable applications, each model is engineered to protect signal integrity while providing the required mechanical hold strength.
Cone Type Tension Clamp
Also known as: cone grip strain clamp, cone dead end fitting
Similar in function to the wedge type, the cone tension clamp uses cone-shaped elements to generate connection force. It provides a strong and reliable conductor grip with or without jumper connectors. This design is particularly suitable for regions prone to high ambient temperatures, where thermal expansion may affect conventional clamping systems. The cone tension clamp is available for both distribution and transmission line applications.
Why Choose Us
Your Trusted Tension Clamp Supplier
We combine manufacturing expertise, strict quality control, and responsive service
to deliver the best tension clamp solutions for power utilities, contractors, and
distributors worldwide.
Own Factory
Integrated manufacturing with casting, forging, machining, galvanizing, and assembly lines — giving us full control over quality, lead time, and cost.
Certified Quality
ISO 9001 quality system. Every tension clamp set undergoes 100% inspection including slip test, tensile test, and dimensional check before shipment.
Global Export
Exported to 50+ countries across Southeast Asia, Africa, Middle East, North America，South America, and Europe. Experienced with international tenders and specifications.
Wholesale & Bulk
Competitive wholesale tension clamp pricing for volume orders. Flexible MOQ, fast turnaround, and reliable container loading for cost-effective global delivery.
Engineering Support
Our technical team helps you select the right tension clamp for overhead lines — from conductor matching to end-fitting selection and torque specification guidance.
Full Product Line
Beyond tension clamps: suspension clamps, cable accessories, insulators, cross arms, and complete overhead line hardware — a one-stop power fitting supplier.
Quality Assurance
Standards & Compliance
DIMI All tension clamps undergo rigorous testing to ensure mechanical performance,
corrosion resistance, and dimensional accuracy in compliance with international
and national standards.
Application scenarios
Application areas of tension clamps
Distribution Lines
Bolted type tension clamps (NLL/NLD) for dead-end termination at LV and MV distribution poles in urban and rural power networks.
≤ 35kV Distribution
Transmission Lines
Compression and wedge tension clamps for high-strength anchoring at angle poles, terminal towers, and long-span river or valley crossings.
35kV – 500kV Transmission
Telecom & Fiber Optic
ADSS cable tension clamps, OPGW tension clamps, and drop cable tension clamps for telecom pole lines and FTTH fiber-to-the-home distribution.
ADSS / OPGW / FTTH
Railway Electrification
Specialized tension clamps for catenary wire and contact conductor anchoring in electrified rail systems, providing secure anchoring under high-speed vibration.
25kV AC / 3kV DC Rail
Substations & Switchyards
Wedge tension anchor clamps and compression fittings for bus bar and conductor termination within substations at all voltage levels.
Substation / Switchyard
Renewable Energy
Tension clamps for overhead lines connecting wind farm collector systems, solar plant interconnections, and long-span cable routes in remote terrain.
Wind / Solar / Hydro
FAQ
Frequently Asked Questions
Common questions from engineers, procurement teams, and distributors about our
tension clamp products.
What is the difference between a tension clamp and a suspension clamp?
A tension clamp (dead end clamp) is installed at terminal and angle poles to absorb the full mechanical tension of the conductor, providing a permanent dead-end connection. A suspension clamp is used at intermediate poles to simply support the conductor's weight while allowing slight longitudinal movement. Tension clamps carry axial loads while suspension clamps carry vertical loads.
Which type of tension clamp should I choose for my project?
For standard distribution lines (≤35kV), the NLL/NLD bolted type tension clamp is the most cost-effective choice. For substations and high-load applications, wedge tension clamps offer excellent self-locking performance. For high-voltage transmission (110kV+), compression type is recommended. For ADSS cable and OPGW fiber optic lines, helical or bracket-type tension clamps are the standard. Contact our engineers with your conductor type and voltage level for a tailored recommendation.
How long does a tension clamp last?
With proper installation and quality materials, a tension clamp typically provides 20–30 years of reliable service. Hot-dip galvanized steel hardware ensures long-term corrosion resistance, and aluminum alloy bodies naturally resist oxidation. Stainless steel options are available for coastal or heavy-pollution environments where extended service life is critical.
Can you supply tension clamps as a complete set?
Yes. Every tension clamp set we supply includes the main clamp body, U-bolts (for bolted types), washers, hex nuts, and lock washers — everything needed for field installation. We can also supply complete dead-end assemblies including the tension clamp, clevis or tongue fitting, insulator string, and pole-mounting hardware as a pre-matched kit.
What is your MOQ and lead time for wholesale orders?
Our minimum order quantity for standard NLL/NLD tension clamps is typically 100 sets, though we offer flexible MOQ for mixed orders. Standard production lead time is 15–25 days depending on quantity and customization requirements. We maintain ready stock of popular models for faster delivery. Contact us for current availability and wholesale tension clamp pricing.
Do you offer tension clamps for telecom wire and fiber optic cables?
Absolutely. We manufacture a complete range of telecom wire tension clamps including ADSS cable tension clamps, OPGW tension clamps, drop cable tension clamps for FTTH networks, and helical dead-end fittings for various fiber optic cable sizes. Each optic cable tension clamp is designed to grip the cable securely without damaging the internal fibers or affecting signal quality.
As one of the most professional tension clamp manufacturers and suppliers in China, we're featured by quality products and good service. Please rest assured to wholesale custom made tension clamp from our factory.
