Preformed tension clamps are spiral dead-end hardware components that secure conductors, ground wires, and fiber optic cables such as Aerial Dielectric Self-Supporting (ADSS), Optical Ground Wire (OPGW), and Optical Phase Conductor (OPPC) in overhead transmission and distribution systems. They terminate cables to structural elements like ground anchors or tower brackets, providing mechanical support and tension control.
The clamps are constructed from galvanized steel or aluminum-clad steel with hot-dip galvanizing and aluminum-zinc coatings for corrosion resistance. A typical assembly includes preformed dead ends, armor rods, shackles, thimbles, and extension links. Helical rods wrap around the cable with inert grit embedded at each turn to increase friction and prevent stress concentration, ensuring uniform stress distribution and maintaining signal integrity.
Key advantages include grip strengths exceeding 95% of the cable’s rated tensile strength and tool-free installation that reduces labor costs. The clamps offer vibration damping and resistance to aging. Technical specifications include compatibility with cable diameters of 9-16mm, rated tensile strengths from 40KN to 120KN, and adaptability to spans from 100 to over 500 meters.
Applications include overhead transmission lines, telecommunication networks, railway electrification, substations, and distribution lines at tension towers, corner poles, and terminal points. Selection considerations involve conductor type and size, environmental conditions, load capacity requirements, and industry standard compliance.
Preformed Tension Clamp Supplier: Superior Reliability and Economic Advantage
RaxPower, as a reliable and experienced tension clamp manufacturer, has a leading manufacturing process in China. Preformed tension clamps are spiral dead-end clamp hardware used to connect ADSS, OPGW, or OPPC cables to utility poles and towers, providing essential clamping for conductors, ground wires, and fiber optic applications in power and communication lines. Made from high-quality galvanized steel or aluminum-clad steel, these clamps feature inert grit at each spiral turn to protect against concentrated stress, ensuring grip strength over 95% RTS, uniform stress distribution, corrosion resistance, and long service life. This design offers superior reliability and economic advantage over bolt type and hydraulic compression type tension sets, with easy installation and no tools required.
Established in 2003 and based in Hebei Province, we have over 21 years of experience, with products proven through widespread adoption in State Grid and exports to over 30 countries. We adhere to the philosophy of quality first, support first, and continuous improvement, leveraging advanced manufacturing like hot forging for greater strength and accurate sizing, along with strict quality control from raw material selection to multi-stage testing, ensuring every clamp meets the highest standards. Contact us now to receive a free quote for our premium quality preformed tension clamp solutions.
| Parameter | Specification |
|---|---|
| Application | Used in utility poles and towers to secure conductors, ground wires, and fiber optic cables (ADSS, OPGW, OPPC) in overhead transmission and distribution systems. |
| Suitable Cable Diameter | 9 mm – 16 mm |
| Span Distance | 100 m – 500 m+ |
| Rated Tensile Strength (RTS) | 40 KN – 120 KN |
| Grip Strength | >95% of cable RTS |
| Breaking Strength | Matches cable rated breaking strength |
| Material | Galvanized steel or aluminum-clad steel |
| Surface Treatment | Hot-dip galvanizing with aluminum-zinc coating |
| Components | Preformed dead ends, armor rods, shackles, thimbles, extension links |
| Additional Features | Uniform stress distribution, vibration damping, corrosion resistance, aging resistance |
| Installation | Tool-free, hand installation |
| Color | Color coded (e.g., Yellow, Red, Blue) for size identification |
Frequently Asked Questions（FAQS）
What is a preformed tension clamp used for?
Preformed tension clamps provide mechanical support and tensioning of conductors in overhead power transmission and distribution systems. They are commonly used for ADSS, OPGW, and OPPC cables, connecting them to utility poles or towers, and ensuring signal integrity by preventing damage from concentrated stress.
What are the advantages of using preformed tension clamps?
Advantages include easy installation, reliable gripping with over 95% RTS, uniform stress distribution, corrosion resistance, long service life, and compatibility with various hardware. RaxPower clamps are manufactured from high-quality materials for reliable performance.
What materials are preformed tension clamps made from?
Preformed tension clamps are constructed from high-quality galvanized steel or aluminum-clad steel, with a uniform hot-dip galvanized coating composed of 5% aluminum and 95% zinc for enhanced corrosion resistance and durability.
How are preformed tension clamps installed?
Installation is straightforward and often requires no tools. It involves positioning the clamp on the cable, aligning the gripping elements, and securing it. Ensure the pre-twisted wire matches the cable diameter and avoid excessive bending or tension to prevent damage.
What types of preformed tension clamps are available?
Common types include dead-end clamps, suspension clamps, strain clamps, guy wire clamps, armor rod clamps, and mid-span clamps for various applications such as termination points, intermediate support, and tension control in overhead lines.
What factors should be considered when selecting a preformed tension clamp?
Consider the application type, conductor specifications, environmental conditions, tension requirements, span distance, and compatibility with hardware like thimbles or shackles. RaxPower provides clamps that meet various international standards.
What quality certifications do your tension clamps hold?
Our products hold ISO, CE, BV, and SGS certificates, ensuring they meet international standards for quality, safety, and reliability in power and communication line applications.
Do you provide installation training and after-sales support?
Yes, we provide comprehensive technical guidance, including installation training and after-sales problem-solving, to ensure proper use and address any issues.
Can you develop custom tension clamp solutions for specific project requirements?
Yes, we specialize in OEM and ODM services, allowing us to customize tension clamps according to your specific market needs and project specifications.
What is your production capacity and lead time for large-scale orders?
We maintain stock for standard models and can fulfill large orders within approximately 15 days, ensuring timely delivery to meet your project schedules.
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