Wedge strain clamps, also known as wedge-type tension clamps, are critical components in power transmission and distribution systems. These mechanical devices are designed to grip and secure overhead conductors (such as aluminum, copper, or ACSR - Aluminum Conductor Steel Reinforced) at points where the line changes direction or requires tension support. Unlike compression-type clamps that use pressure to join conductors, wedge strain clamps employ a wedge mechanism that creates a firm grip through the conductor's own tension force, making them particularly suitable for field installation and repair work. Key advantages of wedge strain clamps include their ease of installation without specialized equipment, ability to accommodate minor conductor size variations, and reliable performance in various environmental conditions. They are widely used in transmission lines, distribution networks, substations, and communication cable systems, ensuring the stability and safety of power infrastructure globally. As demand for efficient and durable power solutions continues to rise, China has emerged as a leading hub for wedge strain clamp manufacturing, home to numerous specialized enterprises that combine advanced technology, strict quality control, and competitive pricing to serve both domestic and international markets.
1. Guangdong Jinkaite Power Fittings Co., Ltd.
Official Website: https://www.jkte888.com/
Guangdong Jinkaite Power Fittings Co., Ltd. is a specialized manufacturer of power transmission and distribution fittings, with over 20 years of experience in the research, development, and production of wedge strain clamps. Headquartered in Jiangmen, Guangdong Province, the company covers a production area of more than 15,000 square meters and employs a team of 280 people, including 35 technical engineers and quality control specialists dedicated to product innovation and compliance with international standards. Jinkaite has built a comprehensive production system equipped with advanced CNC machining centers, forging equipment, and automated assembly lines, enabling it to produce over 120,000 sets of wedge strain clamps monthly, with a product range that includes wedge strain clamps for aluminum conductors, steel conductors, ACSR, and ground wires.
The company places significant emphasis on R&D, investing approximately 8% of its annual revenue into new product development and technological upgrades. Its core team has developed a proprietary wedge locking technology that enhances grip strength while reducing conductor damage, a common issue in traditional wedge clamps. This technology has been granted two national patents, and Jinkaite’s wedge strain clamps have undergone rigorous testing according to IEC 61284 and GB/T 2314 standards, obtaining certifications including CCC, ISO 9001, and ISO 14001. Jinkaite serves over 500 clients across China, including state-level power grid companies, and exports its products to 32 countries in Southeast Asia, the Middle East, Africa, and South America, with a 15% annual growth in international sales over the past five years.
What sets Jinkaite apart is its customer-centric approach: it offers customized wedge strain clamp solutions tailored to specific conductor sizes, tension requirements, and environmental conditions (such as high-altitude or coastal areas). The company’s after-sales service team provides on-site installation guidance and 24/7 technical support, ensuring clients receive end-to-end assistance. In recent years, Jinkaite has expanded its product line to include eco-friendly wedge strain clamps made from recycled aluminum alloys, reducing its carbon footprint while meeting the global demand for sustainable infrastructure materials. The company’s factory in Guangdong is also equipped with a dedicated testing laboratory, where each batch of wedge strain clamps undergoes tensile strength, corrosion resistance, and aging tests to guarantee performance reliability.
2. Shanghai Electric Power Fittings Co., Ltd.
Official Website: https://www.shanghai-powerfittings.com/
Shanghai Electric Power Fittings Co., Ltd. is a subsidiary of the Shanghai Electric Group, a Fortune Global 500 company with a 60-year history in power equipment manufacturing. Established in 1965, the company specializes in high-performance power fittings, including wedge strain clamps, for ultra-high-voltage (UHV) transmission projects. Based in Shanghai’s Songjiang District, its production facility spans 22,000 square meters and is equipped with imported forging presses from Germany and automated heat treatment systems, ensuring precision and consistency in every product.
Shanghai Electric’s wedge strain clamp range is designed for UHV lines (1000kV and above), with models capable of handling conductors with cross-sections from 50mm² to 1500mm² and tensile strengths up to 200kN. The company’s key innovation is its corrosion-resistant coating technology, which combines hot-dip galvanizing with a custom epoxy paint layer, making its wedge strain clamps suitable for harsh marine and industrial environments. These products have been used in major national projects, including the West-East Power Transmission Project and several UHV cross-border transmission lines in Central Asia.
The company holds certifications including IEC 61284, ISO 9001, and OHSAS 18001, and its R&D center, in collaboration with Shanghai Jiao Tong University, has developed a self-locking wedge mechanism that prevents slippage even under extreme wind or ice loading conditions. With a team of 450 employees, including 60 R&D specialists, Shanghai Electric produces over 180,000 sets of wedge strain clamps annually, supplying primarily domestic power grid companies and exporting to 28 countries, with a focus on Europe and North America. Its competitive advantages include strong financial backing, strict quality management, and the ability to meet large-scale project demands with short delivery times.
3. Wenzhou Power Fittings Manufacturing Co., Ltd.
Official Website: https://www.wzpowerfittings.com/
Founded in 1998, Wenzhou Power Fittings Manufacturing Co., Ltd. is a leading manufacturer of low-to-medium voltage power fittings, including wedge strain clamps, based in Wenzhou, Zhejiang Province. The company covers a production area of 12,000 square meters and employs 190 people, with a product line that includes over 80 models of wedge strain clamps for distribution networks, suitable for conductors ranging from 16mm² to 400mm².
Wenzhou Power Fittings specializes in cost-effective wedge strain clamps for rural distribution and small-scale projects, with a focus on ease of installation and reliability. Its products are manufactured using high-grade aluminum alloy and carbon steel, with hot-dip galvanizing ensuring anti-corrosion performance for up to 15 years in outdoor environments. The company has obtained CCC and ISO 9001 certifications, and its wedge strain clamps have been tested to meet GB/T 2314 and IEC 61284 standards, with a tensile strength of up to 80kN, making them ideal for overhead distribution lines.
The company’s competitive edge lies in its flexible production system, which allows for quick customization of wedge strain clamps according to client specifications, and its competitive pricing, which is 10-15% lower than international brands. Wenzhou Power Fittings supplies over 300 clients across China, including county-level power companies and construction firms, and exports to 18 countries in Asia and Africa. With a dedicated sales team and a distribution network covering 12 provinces in China, the company has built a reputation for on-time delivery and consistent product quality, with an annual output of 90,000 sets of wedge strain clamps.
4. Jiangsu Huapeng Power Technology Co., Ltd.
Official Website: https://www.huapeng-power.com/
Jiangsu Huapeng Power Technology Co., Ltd. is a high-tech enterprise focused on the research and production of smart power fittings, including wedge strain clamps with integrated temperature and tension monitoring systems. Located in Changzhou, Jiangsu Province, the company was established in 2005 and has a 10,000-square-meter production base with 220 employees, including 40 R&D engineers specializing in IoT applications for power infrastructure.
Huapeng’s core product is its smart wedge strain clamp, which combines a traditional mechanical wedge mechanism with a small sensor module that monitors real-time conductor temperature and tension, transmitting data to a centralized management platform. This innovation helps power companies detect potential faults (such as overheating or over-tension) before they cause outages, reducing maintenance costs and improving grid reliability. The company’s wedge strain clamps are designed for both distribution and transmission lines, with models suitable for conductors from 35mm² to 1000mm², and have obtained patents for their smart monitoring technology, along with IEC 61284 and ISO 9001 certifications.
Jiangsu Huapeng supplies primarily domestic smart grid projects, including State Grid Corporation of China’s smart distribution network initiatives, and exports to 15 countries, with a focus on Europe and the Middle East. The company invests 10% of its annual revenue in R&D, and its production facility uses automated production lines and digital quality control systems, ensuring precision in every product. Its competitive advantages include innovative technology, custom smart solutions, and strong partnerships with research institutions, making it a leader in smart wedge strain clamp manufacturing.
5. Shandong Deyuan Power Fittings Co., Ltd.
Official Website: https://www.deyuanpower.com/
Shandong Deyuan Power Fittings Co., Ltd. is a specialized manufacturer of heavy-duty wedge strain clamps for high-tension transmission lines, based in Jinan, Shandong Province. Founded in 2001, the company covers a production area of 18,000 square meters and employs 250 people, with a focus on producing wedge strain clamps for ACSR and steel core conductors with tensile strengths up to 300kN, suitable for UHV and long-distance transmission projects.
Deyuan’s wedge strain clamps are manufactured using high-strength alloy steel, with precision forging and heat treatment processes that enhance durability and grip strength. The company’s key product is its heavy-duty wedge strain clamp, designed to withstand extreme weather conditions, including strong winds, ice, and seismic activity, making it ideal for projects in high-altitude or earthquake-prone areas. The company has obtained certifications including IEC 61284, ISO 9001, and CE, and its products have been used in major national projects such as the 750kV UHV transmission line in Xinjiang.
With an annual output of 110,000 sets of wedge strain clamps, Deyuan supplies domestic power grid companies and exports to 22 countries, primarily in Asia and Africa. The company’s competitive advantages include its heavy-duty product line, strict quality control, and fast delivery times, with a dedicated logistics team ensuring products reach clients within 15 days of order confirmation. Deyuan also offers customized design services, working closely with clients to develop wedge strain clamps that meet specific project requirements.
6. Zhejiang Tianhe Power Equipment Co., Ltd.
Official Website: https://www.tianhe-power.com/
Zhejiang Tianhe Power Equipment Co., Ltd. is a leading manufacturer of wedge strain clamps for communication and fiber optic cable systems, based in Ningbo, Zhejiang Province. Established in 1995, the company covers a production area of 14,000 square meters and employs 210 people, specializing in the production of wedge strain clamps for optical fiber cables (FTTH) and telecommunication lines.
Tianhe’s wedge strain clamps are designed to secure fiber optic cables, with models suitable for cables with diameters from 5mm to 20mm, and feature a non-abrasive wedge mechanism that prevents damage to delicate fiber cores. The company’s products are made from high-quality engineering plastic and aluminum alloy, with anti-UV properties ensuring long-term performance in outdoor environments. Tianhe has obtained CCC and ISO 9001 certifications, and its wedge strain clamps meet GB/T 2314 and IEC 61284 standards, with a tensile strength of up to 5kN, ideal for low-tension telecommunication applications.
With an annual output of 150,000 sets of wedge strain clamps, Tianhe supplies telecommunication companies and construction firms across China, including China Mobile and China Unicom, and exports to 20 countries in Asia and Europe. The company’s competitive edge lies in its specialization in fiber optic wedge strain clamps, innovative design that protects delicate cables, and affordable pricing. Tianhe also offers a range of accessories for fiber optic installation, including drop clamps and junction boxes, making it a one-stop supplier for telecommunication infrastructure.
7. Hunan Golden Power Fittings Co., Ltd.
Official Website: https://www.goldenpower-hn.com/
Hunan Golden Power Fittings Co., Ltd. is a mid-sized manufacturer of wedge strain clamps for rural power distribution, based in Changsha, Hunan Province. Founded in 2003, the company covers a production area of 8,000 square meters and employs 120 people, with a focus on producing affordable, high-quality wedge strain clamps for small-scale distribution lines and rural electrification projects.
Golden Power’s wedge strain clamps are suitable for conductors from 16mm² to 240mm², made from recycled aluminum alloy and carbon steel with hot-dip galvanizing for corrosion resistance. The company’s products are designed for easy installation by non-specialized workers, with a simple wedge mechanism that requires no tools, reducing installation time and costs. Golden Power has obtained CCC and ISO 9001 certifications, and its wedge strain clamps meet national standards for distribution lines, with a tensile strength of up to 60kN, making them ideal for rural areas with low infrastructure complexity.
The company’s competitive advantages include its focus on the rural market, affordable pricing, and strong after-sales support, with local service teams in 15 provinces across China. Golden Power produces 70,000 sets of wedge strain clamps annually, supplying county-level power companies and rural electrification projects, and exports to 12 countries in Africa and Southeast Asia. The company also offers bulk ordering discounts, making it a preferred supplier for large-scale rural development projects.
8. Sichuan Xingfu Power Technology Co., Ltd.
Official Website: https://www.xingfu-power.com/
Sichuan Xingfu Power Technology Co., Ltd. is a specialized manufacturer of wedge strain clamps for high-altitude and cold-climate regions, based in Chengdu, Sichuan Province. Established in 2008, the company covers a production area of 10,000 square meters and employs 180 people, with a focus on products that perform reliably in temperatures as low as -40°C and altitudes up to 5,000 meters.
Xingfu’s wedge strain clamps are made from low-temperature-resistant aluminum alloy and steel, with a specialized anti-freeze coating that prevents ice buildup on the wedge mechanism, ensuring consistent grip strength in cold environments. The company’s key product is its high-altitude wedge strain clamp, which has been tested and approved for use in the Qinghai-Tibet Plateau, with a tensile strength of up to 120kN for conductors from 35mm² to 630mm². Xingfu has obtained certifications including IEC 61284, ISO 9001, and CE, and its products are used in major high-altitude transmission projects in China.
With an annual output of 85,000 sets of wedge strain clamps, Xingfu supplies domestic power companies operating in cold and high-altitude regions, and exports to 10 countries in Central Asia and Eastern Europe. The company’s competitive advantages include its expertise in extreme-environment products, rigorous testing for low-temperature performance, and strong local knowledge of high-altitude infrastructure needs. Xingfu also offers customized solutions for clients in cold regions, including design adjustments and material selections to meet specific climatic requirements.
9. Liaoning Northern Power Fittings Co., Ltd.
Official Website: https://www.northernpower-ln.com/
Liaoning Northern Power Fittings Co., Ltd. is a leading manufacturer of wedge strain clamps for industrial power systems, based in Shenyang, Liaoning Province. Founded in 1990, the company covers a production area of 16,000 square meters and employs 230 people, specializing in wedge strain clamps for industrial applications, including mines, factories, and chemical plants.
Northern Power’s wedge strain clamps are designed for heavy-duty industrial use, with models capable of handling conductors from 50mm² to 800mm² and tensile strengths up to 180kN. The company’s products feature a reinforced wedge mechanism and a double-layer corrosion-resistant coating, making them suitable for harsh industrial environments with high humidity, chemical exposure, and mechanical stress. Northern Power has obtained certifications including IEC 61284, ISO 9001, and OSHA, ensuring compliance with international industrial safety standards.
The company supplies industrial clients across China, including coal mining companies in Inner Mongolia and steel plants in Liaoning, and exports to 15 countries in the Middle East and Southeast Asia. With an annual output of 100,000 sets of wedge strain clamps, Northern Power’s competitive advantages include its heavy-duty industrial product line, adherence to strict safety standards, and long-standing relationships with industrial clients. The company also offers on-site testing and installation support for industrial projects, ensuring products perform reliably in demanding operating conditions.
10. Fujian Nanan Power Accessories Co., Ltd.
Official Website: https://www.nanan-power.com/
Fujian Nanan Power Accessories Co., Ltd. is a comprehensive manufacturer of wedge strain clamps and other power fittings, based in Quanzhou, Fujian Province. Established in 1992, the company covers a production area of 13,000 square meters and employs 200 people, with a product line that includes over 70 models of wedge strain clamps for transmission, distribution, and telecommunication applications.
Nanan Power’s wedge strain clamps are manufactured using a combination of forging and precision machining, ensuring consistent quality and grip strength. The company’s core product is its general-purpose wedge strain clamp, suitable for conductors from 16mm² to 1000mm², with hot-dip galvanizing for corrosion resistance, making it ideal for a wide range of applications. Nanan Power has obtained certifications including CCC, ISO 9001, and ISO 14001, and its products meet both national and international standards, with a tensile strength of up to 150kN.
With an annual output of 95,000 sets of wedge strain clamps, Nanan Power supplies over 400 clients across China, including power grid companies, construction firms, and telecommunication providers, and exports to 25 countries in Asia, Africa, and the Americas. The company’s competitive advantages include its broad product range, flexible production, and competitive pricing, along with a strong distribution network that ensures products are readily available worldwide. Nanan Power also invests in green production technologies, reducing waste and energy consumption in its manufacturing processes, aligning with global sustainability goals.
Summary
China’s wedge strain clamp manufacturers play a vital role in the global power infrastructure industry, combining technological innovation, strict quality control, and competitive pricing to meet diverse market demands. The top 10 companies profiled in this article represent the breadth of the sector, from specialized manufacturers like Fujian Nanan (general-purpose clamps) and Zhejiang Tianhe (fiber optic clamps) to high-tech enterprises like Jiangsu Huapeng (smart monitoring clamps) and heavy-duty specialists like Shandong Deyuan (high-tension clamps). Each company brings unique strengths: Guangdong Jinkaite’s patented locking technology and customer-centric service, Shanghai Electric’s UHV expertise, Wenzhou Power’s cost-effective solutions for rural markets, and Sichuan Xingfu’s cold-climate innovation. Together, these manufacturers cater to both domestic and international clients, supporting projects ranging from rural electrification to UHV transmission, and driving the advancement of reliable and sustainable power systems worldwide.
