Square Bar
Product Overview
As a core accessory category within the rail product family, the square bar (flat rail / flat bar rail) stands out for its high strength and adaptability, making it a key solution for linear motion and material conveyance in industrial settings. Manufactured from premium steel and precision processes, our square bar combines durability with cost-efficiency. It is widely compatible with automated production lines, heavy logistics, and varied operating conditions, providing stable support for industrial projects worldwide.
Exceptional Strength & Durability
Made from high-quality carbon steels such as Q235, Q345 and 45# (AISI 1045), and forged with professional heat-treatment processes to ensure structural integrity and load resistance. Surface treatments (hot-dip galvanizing, chrome plating, or powder coating) are available to customize corrosion performance — corrosion resistance improved by approximately 60%. Even in harsh environments such as humid ports or chemical plants, the square bar / flat rail maintains long-term stable operation, with service life extended by 3–5 years compared to ordinary flat steel.
Main Type
| Size | Height(mm)X | Width(mm)Y | Weight(kg/m) |
| 40x30mm | 30 | 40 | 9.42 |
| 50x30mm | 30 | 50 | 11.775 |
| 60x40mm | 40 | 60 | 18.84 |
| 65x40mm | 40 | 65 | 20.41 |
| 70x40mm | 40 | 70 | 21.98 |
| 75x40mm | 40 | 75 | 23.55 |
| 80x60mm | 60 | 80 | 37.68 |
| 90x40mm | 40 | 90 | 28.26 |
| 100x60mm | 60 | 100 | 47.1 |
Custom sizes available — material and load capacity designed per requirement. Heat treatment can raise surface hardness up to 350 HB.
Precision Engineering & Stable Operation
High-precision rolling and straightening processes produce a flatness error ≤ 0.5 mm/m and dimensional tolerance within ±0.1 mm, ensuring minimal vibration and millimetre-level positioning accuracy for AGVs, cranes, and similar equipment. Smooth contact surfaces reduce friction loss, lowering energy consumption and maintenance frequency — suitable for 24/7 continuous operation.
Flexible Installation & Customization
Supports on-demand cutting, drilling, and welding. Standard length: 6 meters; customizable lengths available to suit project layouts. Installation methods include anchor-bolt fixation or welded attachment to the foundation. For multi-rail parallel layouts, professional alignment tools are recommended to ensure parallelism and greatly shorten on-site construction time.
High Cost-Performance & Total Cost Advantage
Compared with specialized linear guides, the square bar / flat bar rail achieves comparable core performance with procurement costs reduced by ≥30%. Low lubrication requirements and long-life design reduce downstream O&M investment — particularly suitable for large factories and ports to achieve “low cost + high efficiency”.
Typical Application Scenarios
Ports & Logistics
Manufacturing
Warehouse & Distribution Systems
Heavy Industry
Quality Assurance & Service Advantages
Authoritative Certifications & Compliance
Products pass ISO 9001 quality management system certification and CE safety standards. Each batch undergoes tensile testing, surface flatness inspection, and salt-spray corrosion testing to ensure quality compliance.
Customization Capability
Full-dimension customization available — material, size, surface treatment, and load capacity. Engineering team delivers tailored designs based on site conditions; shortest customization lead time as fast as 7 days.
Full Lifecycle Support
We provide installation guidance, calibration training, and free technical consultation during warranty. A product traceability system is established so every batch can be tracked, ensuring worry-free procurement and use.
Contact Us Now！
We provide a one-stop custom ordering service for flat rail (square bar) for every project — from material and dimensions to surface treatment and load capacity, all configurable to your requirements, with engineers providing end-to-end support.
We accommodate both small-batch prototypes and large-scale production; custom samples can be delivered in as fast as 7 days, and standard production lead times are typically 14–28 days depending on specifications and quantities.
All products are manufactured under ISO 9001 and CE quality systems; each shipment is accompanied by tensile test, flatness inspection, and salt-spray test reports. Full batch traceability is provided to ensure reliable, guaranteed quality.