Secco Sistemi OS2 75 Steel Window
Secco Sistemi OS2 75 Steel Windows Architectural Steel Windows Engineered for Excellence
The Secco Sistemi OS2 75 is a state-of-the-art thermally broken steel window system, designed for high-performance buildings and refined architectural projects. Manufactured with precision and elegance, OS2 75 blends minimalist aesthetics with industry-leading technical features, making it the ideal choice for architects and developers across the USA.
OS2 75 Secco Sistemi
The ultimate steel windows for your dream house.
The OS2 75 is a state-of-the-art thermal break window system crafted from premium metals, offering both exceptional performance and refined aesthetics. Characterized by its ultra-slim profiles measuring just 27 mm, it ensures a sleek and elegant appearance while maximizing the glazed surface for enhanced natural light. The central node between two adjacent windows measures only 62 mm, contributing to a refined, minimalist design, while the system’s 77 mm depth accommodates glazing up to 50 mm, ensuring superior thermal and acoustic insulation. What truly sets the OS2 75 apart is its unparalleled versatility. It is the only system on the market that supports a full range of opening types, including tilt-and-turn, bi-folding, pivot, lift-and-slide, and anti-burglary configurations. This flexibility allows for seamless integration across various architectural styles and applications, ensuring that all window elements maintain a uniform and harmonious visual appearance. Whether for residential, commercial, or historical restoration projects, the OS2 75 combines cutting-edge technology with timeless elegance, delivering both security and aesthetic excellence.
OS2 75 Technical Performance Highlights
Air Infiltration: Class 4
Water Tightness: Class 9A (600 Pa)
Wind Resistance: Class 5 (2000 Pa)
Acoustic Insulation: Up to 45 dB with suitable glazing
Glazing Thickness: Up to 50 mm (double or triple IGUs)
Frame Depth: 77 mm for optimal structural integrity and insulation
OS2 75 is certified according to EN 14351-1 and meets the stringent requirements of both European and American building standards.
Italian Design
With an extensive selection of over 40 different profiles, the OS2 75 system offers unparalleled design flexibility, allowing architects and designers to find the perfect solution for any formal or functional project requirement. These profiles are meticulously engineered to accommodate both flush-mounted and non-flush-mounted glass panels, providing a wide range of aesthetic and structural options. Whether the goal is to emphasize the borders of the window’s monocolored surface, creating a distinct visual statement, or to make them virtually invisible for a seamless, minimalist look, the OS2 75 system ensures that every design vision can be realized with precision.
Additionally, the system allows for both fixed and operable sashes, ensuring seamless integration within a façade while maintaining the desired architectural coherence. To further refine and differentiate the various design possibilities, we have developed two specialized subsystems: OS2 75.1 and OS2 75.2. These variations provide enhanced customization options, enabling tailored solutions that meet the highest standards of performance, aesthetics, and functionality.
Versatility for Architectural Applications
From luxury residences and boutique hotels to commercial towers and heritage restorations, OS2 75 is engineered to perform across diverse applications:
Modern Residences: Slim sightlines and elegant finishes for expansive glazing and light-filled interiors.
Historic Renovations: Faithfully replicates classic steel windows while meeting today’s performance codes.
Commercial Buildings: Robust construction and weather resistance suitable for high-traffic environments.
Cultural & Institutional Projects: A refined solution for museums, galleries, and public buildings requiring both beauty and security.
Engineered to Outperform
Compared to other premium steel systems, OS2 75 stands out with:
- A unified profile system for all openings, ensuring visual consistency.
- Over 40 profile variations to meet bespoke architectural needs.
- Multiple high-end materials including solid brass and weathering steel.
- Industry-leading thermal and acoustic insulation.
OS2 75 also benefits from Secco Sistemi’s award-winning design legacy, recognized for blending Italian craftsmanship with cutting-edge innovation.
Trusted by Architects Worldwide
Architects and building professionals across the USA specify OS2 75 for projects where quality, longevity, and design excellence are non-negotiable. Portamet ensures full technical support, precise fabrication, and seamless integration from concept to completion.
Why Choose OS2 75 for Your Project?
- Ultra-Slim Profiles: With visible sightlines starting at just 27 mm and mullions as narrow as 62 mm, OS2 75 provides maximum transparency and minimal visual interruption.
- Thermal Performance: Advanced thermal break technology enables Uw-values as low as 1.0 W/m²K when paired with triple glazing.
- Exceptional Durability: Made from galvanized steel, stainless steel, Corten, or brass—OS2 75 delivers long-term performance, even in coastal or harsh climates.
- Flexible Design: Supports all window and door configurations, including fixed, tilt-turn, casement, pivot, sliding, and folding options.
- Custom Finishes: A wide array of powder-coated or anodized finishes to match any design aesthetic.
Secco Sistemi Glazing Bead Options
The slender profiles positioned in front of the glass serve not only a functional purpose by securing the glazing firmly in place but also act as integral design elements that enhance the overall aesthetic of the window frame. Thoughtfully crafted to blend seamlessly with the rest of the structure, these profiles contribute to the window’s refined and cohesive appearance.
To ensure a flawless visual harmony, these fixing profiles are meticulously manufactured in the same premium finishes as the window itself. This attention to detail allows for a uniform and sophisticated look, whether the project calls for a modern, industrial aesthetic or a more traditional architectural style. By combining structural integrity with an elegant design approach, these profiles enhance both the durability and the visual appeal of the window system.
The OS2 75 system stands out as an exceptional innovation in the field of architectural design, earning the prestigious Compasso d'Oro ADI Award in 2018 for its outstanding performance, superior craftsmanship, and advanced engineering. Distinguished by its high-quality materials and cutting-edge technology, OS2 75 achieves an ultra-slim profile without compromising durability or efficiency. This system is meticulously designed to integrate seamlessly into both contemporary and historical architecture, offering unparalleled versatility and aesthetic refinement.
One of OS2 75’s defining characteristics is its extensive range of 40 distinct profiles, all featuring an elegant, minimalistic design with widths ranging from 27 mm to 62 mm. These slim profiles allow for the creation of expansive, uninterrupted glass surfaces, enhancing natural light penetration and fostering a seamless connection between indoor and outdoor spaces. The system is ideal for large panoramic windows, three-dimensional façades, light screens, and sophisticated door and window configurations. To further accommodate diverse design needs, OS2 75 offers four glazing bead options, enabling tailored aesthetic and functional solutions.
This system supports a variety of opening configurations, including internal, external, or dual-direction openings, as well as vertical and horizontal balance mechanisms. Such flexibility ensures that OS2 75 adapts to the unique requirements of any architectural project, making it a preferred choice among designers and architects worldwide.
Beyond its aesthetic and structural advantages, OS2 75 delivers exceptional technical performance, meeting the highest industry standards:
Wind load resistance: Class 5 (test pressure)
Frame bending resistance: Class C
Water tightness: Class 9A
Soundproofing: Up to 45 dB (with Rw 42 dB insulating glass)
Thermal transmittance: 1.04 W/m²K (with Ug 1.0 glass)
Air permeability: Class 4
Through continuous collaboration with leading architects and designers, OS2 75 has become the ultimate system for high-end architectural projects, where profiles, handles, accessories, and glass panes merge into a harmonious, visually striking whole. With its sleek appearance, minimalist design, and outstanding performance, OS2 75 redefines the standards of modern window and door systems.
Os2 75 Thermally broken steel profile
The OS75 steel profile by Secco Sistemi stands out as one of the most versatile and innovative solutions available on the market today. Designed with precision engineering and superior craftsmanship, this profile offers exceptional durability, aesthetic appeal, and adaptability for a wide range of architectural applications.
Our expertise allows us to manufacture an extensive variety of windows using the OS75 profile, ensuring tailored solutions that meet the highest standards of quality, performance, and design. Whether for contemporary projects or historical restorations, this profile provides the perfect balance of strength and elegance, making it an ideal choice for architects, designers, and homeowners alike.
Ready to Get Started?
Portamet is your partner for custom steel windows in any project. For a free quote, project consultation, or to download our brochure, contact us today. Our experts (EN/PL/DE/FR) will help specify the perfect steel window system (Secco OS2, Jansen, Forster, etc.) and ensure fast delivery to your site. Let’s turn your vision into reality with the strength, efficiency, and elegance of Portamet steel windows.