Explore our top-tier 40x40 and engineering-grade structural profiles tailored for high-load industrial frameworks and automation.
Chengdu E&I Aluminum Industry Co., Ltd., in line with the business philosophy of "people-oriented, quality value, technological innovation, and win-win cooperation", is dedicated to the research and development and manufacturing of aluminum alloy products with high difficulty, high precision and high requirements.
The company relies on the National Institute of Nonferrous Metals to maintain a professional aluminum alloy technology research and development team in China's light alloy industry. By bridging the gap between advanced metallurgic science and physical engineering applications, we provide customers with overall solutions for aluminum alloy products such as extrusions, profiles, castings, and forgings.
Our advanced production and rigorous testing equipment guarantee optimal quality control. Excellent professional services create value-for-money commercial benefits for customers, cementing E&I as a robust strategic partner globally. Our primary clients include Fortune 500 automotive manufacturers, heavy industrial developers, and international aerospace components suppliers.
From design to automated anodizing, E&I guarantees high-end structural performance across the entire value chain.
Chengdu E&I Aluminum Industry Co., Ltd. leverages a state-of-the-art manufacturing campus equipped with a diverse fleet of extrusion presses, precision mechanical CNC centers, and automated anodizing, electrophoresis, and powder spraying production lines. This unified structural capacity allows us to provide a comprehensive, one-stop service loop including the design, machining, and structural assembly of modular aluminum frames, industrial workbenches, protective safety enclosures, solar supports, cleanroom structures, and automated assembly lines.
Our catalog features 40 40 profiles produced in strict compliance with the national high-precision standard (GB/T 5237-2008 and international equivalent EN 755). Key attributes include exquisite surface finishes, robust oxide layer thickness (12-15μm), optimal corrosion resistance, and high-strength anti-loosening structural connections designed to perform under high-vibration dynamic loads.
Strict structural tolerances and dimensional stability ensuring seamless alignment for structural joints, brackets, and accessories.
Enhanced surface treatment providing an insulating, wear-resistant, and aesthetically clean barrier against oxidation and harsh environments.
Complete assembly systems including angle brackets, quick connectors, T-nuts, profiles, and structural design support.
To achieve a leading position in China's high-precision aluminum alloy industry in terms of competitiveness, structural design depth, and value-added R&D output. We endeavor to optimize product architectures so our partners, stakeholders, and end-users achieve unmatched return-on-investment and operational efficiency.
Four operational pillars that guarantee absolute consistency, performance, and commercial trustworthiness.
The company regards employees as wealth, understands their pursuit, provides them with better development space and competitive salary, and develops together.
Provide customers with outstanding products and services, and create more value for customers through rigorous inspection protocols.
Continue technology research and development and investment, maintain the leading position and advantages of product technology in the same industry.
Cooperate with the company's customers, employees, shareholders and partners to create value for them, develop together, and achieve win-win results.
An engineering analysis of global market trends, high-load configurations, and modern automation design.
Historically, heavy machinery frameworks relied on welded structural steel. This method required extensive surface grinding, painting, and costly post-weld adjustments. Today, the global manufacturing sector has shifted toward modular aluminum profile systems. Using profiles like the 40 40 (40mm x 40mm cross-section), engineers can deploy structural workbenches, safety guards, and clean sheds using mechanical fasteners. This eliminates welding-induced distortion, shortens lead times, and allows for infinite structural reconfiguration.
The 40 40 profile family is defined by its slot widths—primarily 8mm (slot 8) and 10mm (slot 10). The choice of slot geometry dictates the structural load capacity and matching accessories:
The phrase "EI" refers directly to the mechanical integrity parameters of structural profiles—where E represents the Young's Modulus of the aluminum alloy (approx. 68.9 GPa for 6063-T5) and I represents the Moment of Inertia ($I_x$ and $I_y$, expressed in $cm^4$). When designing structural frames, calculating mechanical deflection under load is essential:
δ = F • L³ / (48 • E • I)Addressing supply chain complexity, international standards compliance, and site-level engineering challenges.
For procurement directors in North America, Europe, and Southeast Asia, sourcing reliable aluminum extrusions requires balancing structural performance with cost efficiency. Many suppliers reduce costs by using scrap aluminum, which introduces impurities and reduces structural integrity.
At Chengdu E&I Aluminum Industry Co., Ltd., we use high-purity virgin aluminum ingots (A00 grade) alloyed with trace magnesium and silicon to guarantee consistent 6063/6061 phase configurations.
| Profile Code | Groove Width | Cross Section | Primary Application |
|---|---|---|---|
| E&I-8-4040LD | 8 mm | 40 x 40 (Light) | Protective covers, light-duty frames |
| ENI-8-4040LC | 8 mm | 40 x 40 (Medium) | Automotive assembly lines, robotics |
| E&I-8-4040R | 8 mm | 40 x 40 (Round) | Display cabinets, aesthetic corner frames |
| ENI-8-4080EL-T | 8 mm | 40 x 80 (Single Sealed) | High-strength linear guides, heavy frames |
| ENI-10-4040H | 10 mm | 40 x 40 (Heavy) | High-stress structural columns |
How E&I guarantees chemical, structural, and mechanical consistency across international borders.
Every extrusion batch undergoes spark emission spectrometer testing to confirm element percentages (Si, Mg, Fe, Cu, Mn) comply with standard 6063 alloy parameters, ensuring structural reliability under load.
Using precise die tooling and temperature control during extrusion, we limit profile straightness deviations to under 0.3mm per meter, preventing assembly issues during long-run conveyor installations.
Profiles are packed in multi-layered protective sleeves to prevent surface scratching during sea freight, arriving ready for assembly. We provide certificates of conformity, RoHS tests, and Mill Test Reports (MTR).
Decarbonization, eco-friendly surface finishes, and smart structural profiles.
As industrial environments become more automated and sustainable, structural profiles are evolving beyond simple metal structures. Chengdu E&I is investing in research areas to meet these shifting requirements:
Engineered answers to common queries regarding 40 40 profile specification, ordering, and structural physics.
The difference lies in the inner wall thickness and cross-sectional geometry. Light profiles like the E&I-8-4040LD use thinner walls to reduce weight and material cost, suitable for light-load enclosures. Heavy profiles like ENI-10-4040H feature thicker walls and internal ribbing, designed to withstand high torque, heavy machinery loads, and dynamic vibration.
Anodizing converts the aluminum surface into a durable aluminum oxide finish. A thickness of 12-15 microns protects against scratches, prevents oxidation in humid factory environments, and provides mild electrical insulation. Thinner, low-quality coatings wear down quickly, exposing raw aluminum to galvanic corrosion at steel connection points.
Yes, Chengdu E&I provides complete processing support. We can perform custom cutting to length, cross-drilling for joint connections, end tapping for leveling feet, and CNC milling based on custom design drawings. Doing so allows components to be assembled directly on site.
Our products meet China's GB/T 5237 high-precision extrusion standard and international equivalents including EN 755 (Europe) and ASTM B221 (USA). We also provide mill certifications detailing chemical compositions and mechanical properties.
High-load and multi-slot structural profiles designed to meet robust industrial engineering specifications.
