What are the differences between 1×7 wire strand and 1×19 wire strand?

In the field of prestressed engineering, 1×7 wire and 1×19 wire PC Steel Strands are the most widely used types of PC steel strands. Due to differences in structural design, they have clear distinctions in mechanical properties and applicable scenarios. As a source factory, we ensure the stable performance of both specifications of PC steel strands through mature stranding technology and a strict quality control system, providing reliable selection solutions for different engineering needs.

To better understand 7-wire and 19-wire PC steel strands, it is necessary to understand their structural essence: the specification classification of prestressed steel strands is based on the steel wire stranding structure. The 1×7 wire strand structure consists of one central steel wire and six outer steel wires, while the 1×19 wire strand structure uses a three-layer stranding design: one central steel wire, six inner steel wires, and twelve outer steel wires (or one central steel wire, nine inner steel wires, and nine outer steel wires). The structural differences directly determine their characteristics, applicable scenarios, and construction requirements, including the following aspects:

I. 1×7 Wire Prestressed Steel Strand

- Core Characteristics: Our factory uses a mature one-time stranding process, resulting in finished products with moderate flexibility, meeting mechanical performance standards, and offering a more cost-effective production method. Nominal diameters are available in standard specifications such as 12.7mm and 15.24mm, meeting common engineering requirements, with tensile strength deviations controlled within a minimal range.

- Applicable Scenarios: Suitable for prestressing tensioning of floor slabs and beams in civil buildings, reinforcement of small and medium-sized municipal bridges, shallow slope anchoring, and other conventional engineering projects. It is currently the most widely used type of prestressed steel strand.

- Construction Advantages: Convenient stranding operation, excellent compatibility with conventional anchors, significantly shortening the construction cycle and reducing overall project costs. We provide one-stop service and customized services to ensure that accessories meet project requirements.

- Our Services: Common specifications are readily available with ample inventory, supporting direct shipping within one week and customized specifications. We also provide comprehensive after-sales service, helping customers reduce costs and improve efficiency from the source.

II. 1×19 Wire Prestressed Steel Strand

- Core Characteristics: The three-layer stranded steel wire structure gives it stronger bending resistance and breaking tensile strength. Nominal diameters can cover large specifications such as 17.8mm and 21.6mm, matching various high-strength engineering requirements and meeting heavy-duty engineering standards and international standards.

- Applicable Scenarios: Primarily suitable for long-span suspension bridges, cable-stayed bridge main cable suspenders, special structure reinforcement in nuclear power plants and hydropower stations, and high-strength support in deep mine tunnels—projects with stringent load-bearing requirements. As a one-stop supplier, we offer products with various tensile strengths and support customization services.

- Construction Notes: Due to its relatively low flexibility, threading the strands is slightly more difficult, requiring specialized tensioning equipment to ensure a smooth and controllable construction process. We also have professional tensioning equipment available for your one-stop procurement.

- Our Services: We support customized process parameters and can be equipped with exclusive anti-corrosion coatings. All our products are certified by national standards and international standards such as ASTM. Direct supply from the source ensures affordable prices and stable, controllable delivery times, saving you time and effort.

In summary, the selection of 1×7 wire and 1×19 wire PC steel strands requires comprehensive judgment based on the project load level, construction conditions, and service life to avoid cost waste or safety hazards caused by mismatched specifications. Our factory has 20 years of experience in PC steel strand production and sales, equipped with fully automated production lines and a rigorous quality inspection system. Our professional technical team can provide selection guidance and project adaptation solutions. We support bulk customization and stable supply, making us a trustworthy long-term partner. Welcome to contact us via email and WhatsApp on our website at any time.