OS2 Series

OS2 Frame Series

Extraordinary Performance meets Breathtaking Style.

Thermal Break

Thin Sight-line

Material Options

Extreme Durability

Sound Insulation

Design Flexibility


Distinctly Superior

– Handmade –

The thermally broken OS2 frame series for windows and doors is a revolutionary system that was inspired by the rise of stringent demands relating to physical and structural functions for new and retrofit construction. Although designed with to surpassing today’s thermal and structural building requirements, what makes the OS2 series distinctly diverse is the ability to integrate mass system customization instead of conforming to typical industrial uniformity. The impressively slender characteristics blends architectural design, personalized comfort, and well-being with exceptional thermal and sound insulation. As proof of its brilliant design, the OS2 series is one of the very few window and door systems having been accepted into the Hall of Fame of the Italian Design.

Frame Spec's - Thermally Broken Steel USA

Frame Details - Thermally Broken Steel USA

Window & Door Configurations

Glazing Bead Styles

The OS2 thermally broken steel frame series for windows and doors offers a wide variety of glazing beads (a.k.a. “glazing stops”) to meet any style imaginable. Unless indicated otherwise, all glazing beads are offered in the same materials and finishes as our OS2 series frames. The 6 base styles (from left to right) include; Square (offered in four depths: 5/8″, 3/4″, 13/16″ aluminum only, & 1 1/16″ aluminum only), Rounded, Gothic, J Shaped, Sloped, and Thin. All bead styles can be matched with stylish simulated and true divided muntins for a truly personalized window or door system. We also have the ability to create new and exciting custom beads if so required.

Material Options

One of the many ways the OS2 series shows its diversity is through it’s extensive line-up of material and finish options. The five (5) principal cold-rolled material types are (from left to right): Hot-Dipped Galvanized Steel with a Powder Coated finish (textured, metallic, marine grade and custom colors available), Bronze (numerous patinas available), Stainless Steel (AISI 316L with Scotch Brite finish), Cor-Ten (numerous patinas available), and New in 2016 is our Raw Steel (a.k.a. Blackened Steel) which is available in a wide variety of patinas.

OS2 Steel Frame Material Options

OS2 Steel Frame Assembly Overview

Assembly Overview

So how is this superior system assembled? Let’s take a closer look. Referring to the 3D rendering to the left of an Inswing Casement, we have identified the five (5) most critical components: (a) Glazing pocket for a Glass thickness up to 1 9/16” (40 mm), (b) Glazing Bead and EPDM gasket – the Gothic Bead is shown, (c) Exterior Rebated EPDM sealing gasket with dedicated groove and weep system, (d) Interior EPDM sealing gasket with dedicated groove, and (e) Structural Thermal Break consisting of polyamide and fiberglass reinforced high density polyurethane.

Narrow Sight-line

Big performance packed into a well engineered envelope. Ideal for any style of architecture – from super sleek and modern too historic retrofits and Landmark Approvals – the OS2 series features a some of the narrowest sight-lines for thermally broken steel windows and doors in the world! As observed on the detail to the right, our fixed windows are capable of sight-lines as narrow as 1 1/16” (27 mm) and our casement windows are as slender as 1 7/8” (47 mm). For more technical details, please refer to the Cutsheets and Elevations section of our Resource page.

OS2 Steel Frame Sight-line

OS2 Frame Thermal Performance

Thermal Performance

The patented thermal break technology incorporated into the OS2 series – as well as many of our other frames – is one that many try to replicate, but cannot. The principle difference being that our interior and exterior steel profiles are bonded using a two (2) step process; a mechanical polyamide press fit as well as a fiberglass reinforced high density polyurethane resin which provides the non-conductive barrier as well as the structural and adhesive bond between the profiles. With that said, the OS2 series clocks in with an impressive average U-value of 0.28 BTU/hr*ft2F (1.60 W/m2K).

Hardware Collection

The state-of-the-art range of hardware and accessories we offer for our OS2 series windows and doors combines’ style with precision and trusted functionally. To do this, we work directly with the most revered hardware specialists in the world; such as SiegeniaTM, AGCTM, OlivariTM, NanzTM, and ASSA ABLOYTM (just to name a few), which allows us to combine maximum product quality with utmost efficiency and economy to continuously deliver comprehensive hardware solutions that add value and security in any residential or commercial application.

OS2 Frame Hardware Selection for Steel Windows and Doors

OS2 Frame Glass Selection for Steel Windows and Doors

Quality Glass Selection

When it comes to any building application, especially historic replacement projects, it is crucial to have the right glass at the right cost. We work one-on-one with the best glass providers in the world to deliver a solution that is ideal for your project. For heritage projects specifically, we can supply an excellent range of leaded single pane or dual pane glass as well as custom stained glass and laminated or non-laminated restoration glass to meet stringent modern building safety codes.

OS2 Frame Sample Kit

Request a Sample Kit

If a fully glazed, over-sized, OS2 corner sample with your choice of glazing, finish and material isn’t enough, we also include additional material, finish and profile samples for a true reflection of our attention to detail.

Come Tour our Factory

Interested in observing how our OS2 Frames are made? Come meet and watch the talented artisans creating your product. From forming the steel profiles through final inspections and packaging, you will experience it all.

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Speak With Us - Thermally Broken Steel USA
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