
BF-S20
Ultra-slim interior steel
Our own 20 mm slim profile, CNC-fabricated, for interior steel-and-glass: sliding, pivot, folding and fixed panels.
- Sightline
- 20 mm
- Profile
- 20×42 mm
- Thermal break
- No
NATIONWIDE DELIVERY • CUSTOM DIMENSIONS • SHOP DRAWINGS BEFORE FABRICATION →
Every BlackFramed system begins with an identifiable European profile, not generic steel tubing. Here you'll find the profile systems we build on, construction methods, glazing options, finishes, and technical details used throughout our projects.
Whether you're specifying for a residence or a commercial project, every opening is fabricated to approved shop drawings and built to the exact requirements of your project.
Many steel doors are welded from generic rectangular tube. A profile system is designed section by section, with the glazing rebate, gasket channels and hardware chambers formed into the steel itself.
That shows in the sightlines, in how the glass is held, and in whether the opening has been tested as a complete system. It's why every BlackFramed opening starts with a named European profile.
Every project starts with the right profile system. Rather than manufacturing generic steel frames, BlackFramed fabricates using original European systems engineered for different applications, from ultra-slim interior doors to thermally broken exterior glazing.
Each profile offers its own structural characteristics, sightlines, thermal performance, and design possibilities. We'll help specify the system that best fits your project.

Ultra-slim interior steel
Our own 20 mm slim profile, CNC-fabricated, for interior steel-and-glass: sliding, pivot, folding and fixed panels.

Swiss ultra-slim interior steel
Swiss 100% steel interior system with face widths from 23 mm, for doors, pivots and fixed glazing.

Heritage interior steel
Heritage single-glazed interior steel.

Hot-rolled heritage steel
Hot-rolled solid steel, slimmest profile, single-glazed. Interior partitions, screens, hinge and pivot doors.

Thermally broken exterior steel
Thermally broken Austrian steel exterior system, double or triple glazed.

Thermally broken heritage steel
Cold-formed galvanized with a thermal break. W40 sightlines, insulating glass to 38 mm. Exterior windows and doors.

High-performance exterior
Thermally broken exterior system, glass to 50 mm. Galvanised, stainless, corten or brass.

European aluminum sliding system
European aluminum sliding system from the Netherlands, 18 mm visible width, leaves up to 4.2 m high.
| Profile | Application | Thermal | Sightline | Best For |
|---|---|---|---|---|
| BF-S20 | Interior | No | 20 mm | Interior doors |
| Forster Presto XS | Interior | No | 23 mm | Partitions & pivots |
| Ottostumm W20 | Interior | No | Heritage | Traditional interiors |
| Ottostumm W40 | Exterior | No | Slim | Luxury homes |
| Welser | Exterior | Yes | Slim | Entry doors |
| Ottostumm W50-TB | Exterior | Yes | W40-slim | Energy-code exteriors |
| Secco Sistemi OS2 75 | Exterior | Yes | Premium | Large glazing |
| Linear (aluminum) | Exterior | Yes | 18 mm | Large sliding openings |
Every BlackFramed opening is built from identifiable European components, not generic steel fabrication. Each profile system, glazing specification, hardware set, and finish is selected to suit the application, performance requirements, and architectural intent of your project.
Every specification is finalized through approved shop drawings before production begins.
Every frame leaves us finished in Tiger Drylac, a premium architectural powder coat.
It's a different thing from wet paint. The colour holds in full sun without fading, and it shrugs off scratches, corrosion and chips for decades. It goes on with no solvents and cures hard and even across the whole section. Pick any RAL colour, in matte, satin or gloss.
Any colour you specify. Most people land on black, bronze or a warm metallic, but any RAL shade is on the table. Have a browse through the full palette at ralcolorchart.com.
Tell us the glass by name while we're drawing. Most projects pair clear with one textured glass for the wet rooms.
It's all toughened safety glass, made to ANSI Z97.1 / CPSC 16 CFR 1201. Double-glazed, laminated and low-e are all on offer across the patterns, unless we flag otherwise.



If your question isn't here, the answer is one email away.
Spec, lead-time and trade questions get an answer within a business day. Send us a project and we'll usually come back the same day, with a shop-drawing turnaround included.
Eight:
About 10–14 weeks once your order's confirmed and the shop drawings are signed off. We get those drawings to you within 5–7 business days; the thermally broken systems can add a couple of weeks. Either way, we put the dates in writing before anything goes into production.
Yes, anywhere in the US and Canada, shipped from our North American facility. Everything's palletised and tracked, with a delivery window we confirm in writing, and we handle the customs paperwork on Canadian orders. International freight we'll quote for you.
Every order is custom. We don't keep stock sizes. We build to your dimensions, your configuration and your finish, and we're glad to take on arched openings, pivots, corner no-mullion systems and the more unusual geometries. We'll confirm the sizing limits when we spec it.
Heavier than aluminium; steel has real weight to it. As a rough idea, a single-glazed W40 hinge panel can be around 400 lb, and a double-glazed OS2 75 pivot 200–310 lb. We put the exact panel weight on every shop drawing so your installer can plan the lift and the hinges.
The safety glass meets ANSI Z97.1 / CPSC 16 CFR 1201, and the Ottostumm and Secco systems come with their makers' own type-testing for thermal, acoustic and weather performance. Need project-specific test data or CAD details? Just ask.
We don't install ourselves, but we work with good installers across the major US and Canadian cities and can point you to one. Everything arrives assembled, glazed and finished, ready to set straight into the opening, and we include installation guides, checklists and phone support with every order.
Send over your plans and elevations and we'll come back within a business day with the profile we'd recommend, ballpark pricing, and a timeline for shop drawings.