Ottostumm | Mogs

W40 Steel Doors & Windows

Custom steel doors and windows made with original Ottostumm FerroFinestra W40 profiles. Hot-rolled steel, slim frames, and configurations tailored to your project.

Request a Quote Download technical guide

W40 steel window wall with two top-hung vents open against a brick wall

Why choose W40

W40 combines the proportions of traditional steel windows and doors with modern glazing and hardware options. It suits historic renovations, new homes, and commercial spaces where slim steel frames are part of the design.

Solid hot-rolled profiles provide strength while keeping the frame narrow. The system accommodates insulating glass up to 31 mm thick and supports a wide range of door and window configurations.

Two black W40 steel door openings looking onto a garden terrace

System features

Material: Solid hot-rolled steel
Steel section thickness: 3–5 mm
Glazing: Insulating glass up to 31 mm
Windows: Side-hung, top-hung, bottom-hung, tilt-and-turn, and pivoting
Doors: Hinged, sliding, and folding configurations
Details: Multiple glazing bead profiles and traditional or contemporary hardware

Available configurations depend on opening dimensions, glass weight, and hardware requirements.

Made to your specifications

Choose your dimensions, glass, finish, hardware, and divided-lite layout. BlackFramed coordinates specifications, shop drawings, fabrication, and delivery.

Shop drawings are prepared after the deposit and submitted for approval before production.

Is W40 right for your project?

W40 is a non-thermally broken steel system. Exterior use depends on the project’s climate and energy-performance requirements. If your project requires a thermal break, we can help you select an alternative system.

Need a thermally broken system?

W40 is a non-thermally broken steel system. For exterior projects requiring better insulation, we offer Ottostumm W50-TB, which combines classic steel detailing with an integrated thermal break.

Explore Ottostumm W50-TB